Fix this problem once and for all

Good day all Please assist me because DSTV debited my money on the second of (2) may 2017 and it did not go through the first time and did second time. I have ask the bank FNB branch at soshanguve crossing to give me proof or letter we can send to them but they said they can only give me bank statement nothing else and they can also see DSTV did debit R1442.15 but they cant help except MULTI CHOICE.They still maintain the money was not received the bad part of this is i call them several times with proof send to them many times to no avail i cant even reverse the money because is over 40 day so i can pay it with hand please my bank assist me this is a lot of money . Regards Lucky