Mobile phone contract

The man in the phone shop greeted me with what I presume is a look specifically designed and reserved for those asking to cancel their contracts. This look could best be described as ‘You are dead to me. Get out.’ I have been trying to cancel this contract for many years. I never use the phone, I have another one, with another company. But the bill for the old Sim card still comes out of my bank account and I can’t work out how to make it stop. I rang them as usual at the start of the year – this has been my New Year’s resolution for seven or