No response in trying to cancel my account...

I have been trying to cancel my Matrix account since the beginning of the month (to ensure 30 day notice period). I called the call centre and was told to look at the website for the cancellations email address. I sent an email to this address and got no response. I then called again and was told again to email - this time the call centre consultant gave me another email address and told me that the one I had used (and got off the website a few days before was wrong). I have still had no reply to either of my emails. My car was sold last month and already I have paid for Matrix now for an extra month but this needs to be sorted out so that I don't pay again in April. I see I am not the only one who has experienced this frustration... Please help me...