DSTV

I have a Premium subscription and last week i got 2 unsolictited calls from companies on behalf of DSTV (1) was to offer me a new decoder (2) was to sell me decoder insurance. i declined both. Coincidently now my decoder now is giving me problems . Hard drive is now faulty. I am not sure how it is possible that after a few days of declining these offers my decoder is faulty . i have to know cancel my subscriptions. DSTV you don't have my permission to give out my details.