Cancelling premium

I accidentaly bought diamond membership. I had free trial of the diamond membership when my phone stopped working and thats why I forgot to cancel it in time. I tried cancelling it about an hour after I got the notification about the transaction(got charged 109£ - the yearly amount) and failed to do so. When I tried contacting the support all i got were autogenerated responses which told me according to the general terms I wont be getting my money back. I would be happy to hear any suggestions or if anyone had encountered similar problems and resolved them. I can add my account info if it helps.