Bad service from DSTV

I am very dissapointed with the service I got from DSTV Multichoice, I had a price lock 2 year contract with them and it was ending now in April, they sent me an email with upgrade promotion for R439.00 pm, I tried to get hold of them to no avail. I then paid the subscription. now they blocked my account saying that my account is in arrears because I still have another installation contract with them which I still owe, what I don't understand is how can someone have installation contract? and how can the normal contract end and the installation contract of which I know nothing about is still running. even worse Installation is free how can one have installation contract. Theodora gxowa is the consultant who was assisting me and it looks like she knows nothing abount customer service as she failed to help me. I called their customer service department couple of times and no one is helping me my account is still blocked from Saturday