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Gwirio a yw galwad ff么n rydych wedi鈥檌 chael gan CThEF yn ddilys

Gwirio rhestr o gysylltiadau ff么n diweddar gan CThEF i鈥檆h helpu i benderfynu a yw galwad ff么n rydych wedi鈥檌 chael yn sgam.

Gan:
Cyllid a Thollau EF
Cyhoeddwyd
30 Gorffennaf 2021
Diweddarwyd ddiwethaf
30 Ebrill 2026 — Gweld pob diweddariad

Os nad yw鈥檆h galwad ff么n wedi鈥檌 rhestru yma, gwiriwch gohebiaeth CThEF sy鈥檔 defnyddio mwy nag un dull cyfathrebu.

Rhoi gwybod i CThEF am alwadau ff么n, e-byst neu negeseuon testun amheus (yn agor tudalen Saesneg).

Rheoli dyledion

Mae CThEF yn anfon negeseuon llais at rai cwsmeriaid, sy鈥檔 esbonio鈥檙 hyn y mae angen i chi ei wneud os ydych ar ei h么l hi gyda鈥檆h taliadau. Bydd cwsmeriaid yn cael y rhain fel galwad ff么n i ffonau llinell dir a ffonau symudol. Byddan nhw鈥檔 rhoi gwybodaeth am dalu CThEF (yn agor tudalen Saesneg) neu rif ff么n llinell gymorth.

Mae CThEF hefyd yn anfon negeseuon sy鈥檔 tynnu sylw at bwysigrwydd defnyddio鈥檙 wybodaeth gywir wrth dalu.

Ni fydd y negeseuon yn gofyn am wybodaeth bersonol na gwybodaeth ariannol o unrhyw fath.

Deall safbwyntiau o ran erlyniadau treth

O 20 Ebrill 2026 hyd at a chan gynnwys 18 Mai 2026, mae鈥檔 bosibl y byddwch yn cael galwad ff么n gan Verian.

Mae CThEF yn gweithio gydag asiantaeth ymchwil annibynnol, Verian, i gynnal ymchwil sy鈥檔 archwilio ymwybyddiaeth mewn perthynas ag erlyniadau twyll treth a deall rhagor amdanynt.

Mae鈥檔 bosibl y byddwch yn cael galwad ff么n gan Verian yn gofyn i chi i gymryd rhan yn yr ymchwil hon.

Mae cymryd rhan yn wirfoddol, ac os gwnewch hynny, bydd eich atebion:

  • yn gyfrinachol
  • yn ddienw
  • yn cael ei defnyddio at ddibenion ymchwil yn unig

Ni fydd Verian yn gofyn i chi am wybodaeth bersonol ariannol.

Colli galwad neu leisbost gan CThEF

Gall CThEF gysylltu 芒 chi dros y ff么n neu adael lleisbost o鈥檙 rhif hwn - 0300 200 3884.

Nid rhif ymholiadau cyffredinol CThEF yw鈥檙 rhif ff么n hwn.

Os byddwn ni鈥檔 cysylltu 芒 chi, byddwn yn gwneud y canlynol:

  • eich ffonio ar ddyfais symudol neu linell dir
  • byth yn gofyn am wybodaeth bersonol neu ariannol yn ystod yr alwad

Os byddwch chi鈥檔 colli鈥檙 alwad, efallai y byddwn ni鈥檔 gadael lleisbost i roi gwybod i chi y byddwn ni鈥檔 ceisio cysylltu 芒 chi eto.

Os ydych chi鈥檔 defnyddio nodweddion blocio galwadau, gwiriwch ei fod yn caniat谩u galwadau gan CThEF (0300 200 3884).

Galwadau ff么n eraill y dylech eu gwirio

Gallwch hefyd wirio鈥檙 galwadau ff么n a restrir ar y dudalen gohebiaeth CThEF sy鈥檔 defnyddio mwy nag un dull cyfathrebu.

Updates to this page

Cyhoeddwyd ar 30 Gorffennaf 2021
Diweddarwyd ddiwethaf ar 30 Ebrill 2026 show all updates

  1. Information about receiving a 'Missed call or voicemail from HMRC' has been added.

  2. Information about 'Understanding views on tax prosecutions' has been added.

  3. Contact date for 'Inheritance Tax 鈥� nil rate bands' has been extended to Friday 28 November 2025.

  4. Information about 'Inheritance Tax 鈥� nil rate bands' has been added.

  5. Added translation

  6. Information about 鈥楻esearch into arranging temporary work abroad鈥� has been added.

  7. Information about 'Electronic invoicing 鈥� small and medium business usage and attitudes' has been added.

  8. Information about pension research has been added.

  9. Information about 'temporary overseas working 鈥� social security research' has been added.

  10. Information about 'VAT on private school fees 鈥� registration reminder' has been added.

  11. Information about Capital Gains Tax when selling a rental property research has been added.

  12. Information about Single Trade Window user testing has been added to the page.

  13. Research on Enterprise Investment Schemes has been extended to Wednesday 31 January 2024.

  14. Information about Enterprise Investment Schemes research has been added.

  15. Added translation

  16. Inheritance Tax and property valuation research and customs declaration follow-up research contacts added.

  17. We have added 'New starter checklist research' and removed 'Coronavirus Job Retention Scheme 鈥� research about employers' experiences'.

  18. Research on employers' experiences of the Coronavirus Job Retention Scheme has been added.

  19. Added translation

  20. Added information on Self Assessment tax return 鈥� research with first-time customers.

  21. Added information on Haulier's Survey.

  22. Added information on research to understand customer experiences of making a tax code amendment or correction.

  23. Added 'Digital Products and Services 鈥� research with businesses and agents' section.

  24. Added 'VAT returns communications campaign 鈥� research with businesses' section.

  25. A road hauliers survey will be carried out between August 2021 and 31 October 2021.You may get a telephone call from IFF Research to invite you to take part.

  26. Added translation

Argraffu'r dudalen hon

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