JET ACCOUNT CLOSED, SO PLEASE CANCEL MY CONTRACT

I had a Jet account for many years, and at some stage I was offered an RMCS contract which I was pleased with. I have never had a problem using this contract. It was all good until I was retrenched and had to close my Jet account amongst others. I've been to Jet stores a number of times to explain that I still receive airtime from them, can they please cancel the contract as it is unpaid for since the account is closed already. Without any success, eventually they gave me a number to call, which I tried ***, still no luck. So please cancel my contract cause you are not getting any payments from me.