No reply from Customer services via telephone or e-mail

I have been attempting for the past two weeks to get a hold of someone at customer services via telephone and e-mail. I have sent 6 emails none of them have been answered not even an acknowledgement of receipt of mail and have spent almost an hour on the phone on various occasions and can’t get to speak to a consultant. I want to cancel my contract which expires on the 13th November, I requested a final invoice to settle my account with no response what so ever. I have now stopped the debit order at my bank. Very very poor service or should I rather say non-existent service.