Bad service

I did do subscription with multichoice around November for exploration which was not installed. Upon checking my credit score it shows that I was listed by multichoice. I was advised that they will clear everything if I can return their equipment. It was eventually collect when they send courier. Today I was surprised when I'm trying to subscribe for access dstv I'm having outstanding debt of R4000 for service I didn't have. I have tried to contact them I was send to pillar to post holding for 2 hours. I'm gatvol with the treatment that I'm receiving from their call centre agent.