Just cancel my service, stop lying and refund my money

On 11 May I submitted in writing via email, as instructed by Giovanni at ADT, stating that my service with them was to be cancelled effective 30 June (to allow for the 30 days notice period). I did not notice that they took off the July subscription and when they did it again in August, I resent my email to Giovanni, asking why it was not cancelled. I also phone ADT to speak to him and he was off sick and I left a message that I want someone to deal with this. Hester called me back a few days later and I resent the email to her. In the meantime I had received an out of office reply from Giovanni, so I know that the email had been delivered to him. He has the gall a few days later to phone me and inform me that he has never received any email from me. Clearly he does not know how emails work, as the out of office reply tells me that he certainly did get it. Blatant lie or completely incapable of doing the simple tasks. He now manages to locate the latest copy of the email that I sent.

Days later, still no reply or actions. Yesterday I call him asking why I am still having to phone him and why this has not been resolved. He asked for the original email AGAIN. It was also sent to his manager Rene. He phones back later to inform me that they will now cancel my subscription but will not be refund the last 2 months subscription that they took, as according to Giovanni, who we now knows is not honest in his communications or able to work with emails, I had never sent the original to him. I have twice asked for acknowledge from his manager, Rene, that they in possession of my umpteenth email to them, and surprisingly I have received no reply.

This is diabolical service from a company who, from all of the posts on this forum, seem to do this on a regular basis.