Cannot cancel contract

I have been trying to cancel a contract with Virgin Mobile since January to no avail. I have been to a store, telephoned several times and emailed. In store and in reply to my email I was told that the contract can only be cancelled by telephone. Again today I phoned several times and spoke to 3 different consultants only to be put on hold indefinitely, having to listen to their awful music over and over. I spent a total of about 45 minutes on hold. One of the consultants confirmed that there is record of me calling in January to cancel but she said I spoke to the wrong person so it wasn't done??? Each time they put me through to \the right person"I end up on hold. What do I have to do to cancel? Surely this is *******?"""