No service

I have been trying to cancel my data contract on ***. I went to the store, they can't help me, I phoned their cancellation line and was on hold for 45 minutes and for 1 hour, then I was cut off!I wrote to them for somebody get hold of me ASAP, nothing. I got hold of the online call centre, not response. I am so unimpressed! Ideally don't want another years contract because they said that I hadn't cancelled in time<br>