Poor service i got from multichoice dstv

So last on the 29th of September I pay Dstv double the amount that I was supposed to be paying, I have send them an email requesting them for my refund they asked me to send the my bank statement and the proof of payment which I did send them, till today I haven't received my refund multichoice is refusing to give me my money back, all the call centre agents that I spoke to all all playing me around, they are sending me back back and forth the first one that I spoke to told me that she have processed my payment I will get it within 7 working business, till now I haven't received my money back. I am definitely closing my account with dstv period.