Complaint and cancellation request

I have the DSTV account number ***. I've been making a mistake with my brother's reference number*** for the past two months. I called the useless company several times to explain my mistake, and I even sent them the reference number I received when I made the payment as well as my bank statement to prove that I had made a mistake. They are still unable to assist me. They keep asking me to send a pdf bank statement after I've verified all of the necessary imfprmation dates and times. Pictures of my Bank statements and reference numbers are provided.I even instructed them to contact my brother and inquire as to what I was saying. They keep telling me that they are unable to assist me. All I require from this company is that they cancel my account.