You stole my money!

Last month or so i upgraded to Dstv Compact-plus. i had sufficient credit in my account since i always pay months in advance. i was told to pay R45 end of October which i did without asking why. I later received an sms informing me that i have to pay R881.32 and that was a shock to me. i called the call center and i was informed that i have been upgraded to Premium package. What a shock!! The so-called premium channels are not even showing/accessible yet i have been charged for them. I did not upgrade to premium and therefore want my money back. Please credit my account back with the money that you stole. If i upgraded to premuim, why is it that the channels are not showing? Please refund me. the guy i spoke to promised to investigate and call me back and as usual i am still waiting.