Did not disconnect old decoder

Last year my old decoder broke and I replace it with a new one. I had phone to activate the new decoder and deactivate the old one. The old decoder was deactivated and the new one activated. More than a year later, I started to have billing problems with my account. when I phone in, I was notified both decoders was running and being paid for. and I am in arrears of R571. I phone twice to fix the problem and the end result was that I must supply the date of the phone call I activate and deactivate the decoders, and I have to give the phone number I had phone from. (information I don't have anymore a year later) In the conversation I had today the consultant stipulated that I must have made it clear that I wanted the old decoder deactivated. WHY WOULD I KEEP A BROKEN DECODER RUNNING? I also hereby notify Multichoice that I WILL NOT pay the outstanding amount. So please hand me over if need be. In short, my decoder broke, I replaced it, I got billed for 2 decoders, Multichoice have to determine first that I stipulated that I deactivate the broken decoder, the problem cannot be resolved due to the fact that the calls cant be recalled without a date.