How can I fully cancel my contract with Three Mobile?

[dadiomouse]

I haven't been in the country (UK) for 6 years.

I haven't used this Three Mobile sim card for 6 years.

I have been paying a monthly amount of around 20 pounds for the last 6 years.

*How* can I fully cancel this service and *end* getting billed / direct debits?

PAC / STAC things apparently only work IF I transfer to another provider - which I do not (and cannot, I'm not in UK!) want to do. If I haven't transfered to a new provider within 30 days... my service with still Three continues!

Please, please, please, *how* can I simply *cancel* this service?

[Officina-red]

You will have to contact Three https://www.three.co.uk/support/contact-us you could try a live chat, if that doesn’t work call Three, or if you have a friend or relative in the UK that could use a Stac code for you, might be worth trying. 

[MZone]

Contact customer services here and give your 30 days notice to cancel.