DSTV unduly enriches them with clients payment

My wifea made an EFT payment of R5000 into their account in error and called their call centre. I was advised to send my ID, her ID and copy of the bank statement they will refund. I did that then I called again. I was advised by an agent to rather reverse it at the bank as they will take long to refund. Went to the bank to do the reversal and multi choice refused to return funds to me. I called again was told they never received the email probably because the reference number doesnt have a reference number. Anyway i resen the docs 5 times and was sent a form. Asked to resend the forms which i did. Then they sent a form to complete. After ample timeand being sent proof of payment, I am now being ask to go the bank and queue and ask a teller to stamp the same bank statement i sent to them before they could refund. It is clearly they have no intention of refunding are using this a tactic to delay the payment. What is the difference between the statement given and going to the bank and getting a stamp? These people need to stop playing games and refund this money. in fact they had no business refusing my bank to reverse this transactions except their intention to unduly enrich themselves.