DSTV does not want to refund me

I mistakenly paid my DSTV account 3 times, I asked DSTV to refund me which they asked me to send a couple of documents of which I did, then I was told tthey have processed the refund and the amount will be on my account in 3 to 7 days, when i followed up , i was told the documents were not correct i must send more documents of which i did and I was told the refund was processed. I followed up again after few days and i was told the request was rejected but now they have submitted it again, I did follow up for the third time and i was told it was not submitted correctly but noe they have submitted. It has been three weeks now and i feel like you guys are wasting my time because you keep lying to me because even now when i check, the amount is still reflecting on my dstv account which means you have not processed the refund. what does a person has to do to get a refund from you,my Customer number: ***3