Problem account since last year

I moved over from a normal HD decoder to DSTV price lock with the xplorar last year may. I have cancelled my old subscription since then but yet still today I have the same problem. Getting charged for a premium i am not even using. I even sent a recon of account to say i am up to date and yet still it shows i am owing money. I even went to Multichoice in Benoni to try and sort it out. Even though the lady behind the counter was helpful the lady on the phone was not. I tried to explain to her I do not have another account and why is it still linked that I have another account. I went on my DSTV account via internet during this week and it shows on their that I have a second subscription still and I owe money on it. I am not paying it because i do not have it. If you check what decoder is on in my house you will see. I can even send it through via email. I do not want anything over the phone anymore as I get promised over the phone it will get sorted and everything but yet nothing ever does so if you want to talk to me please email me. I don't think DSTV cares about their clients anymore and it is really sad.