Nightmare trying to cancel contract

I have temporarily relocated overseas, and have now struggled for 3 weeks to cancel my contract. The day before I left, I contacted the cancellation helpline and they promised that a quote would be sent through, but it never was. I then tried (in vain) to find any email address for cancellations - but there was nothing to be found on the website. By this point, I was overseas, and eventually managed to send an email off to an unmanned mailbox. I received a reply 2 weeks later only to be told that my query had been settled, and another email with the settlement quote from the 21 Sept (It was now the 5th October) - the quote had long since expired and I had already paid my October account. It seem IMPOSSIBLE to contact anyone via email and even more impossible to cancel a contract from outside the country. Absolutely appalling service for the high prices we pay.