REQUESTING FOR MY REFUND

I made a payment of 110 rands on my MTN APP on the 15th of this months. Then on Monday I received money on my bank account when I check my bank account MTN deducted a 110 rands from my account. I made a phone call same day enquiring about this and operator that was helping said the the payment that I made on the 15th has not reflected on their side they only see the one MTN took from my account she advised that I wait for the next day and I did. The following I made a phone call again and the agent that was helping sent my her email address so that I can send the proof of payment to her and I did. After I sent the email I received an email saying that they saw my case and I should send then a proof of payment and I did that was on the 18th. The following day the 19th I receive the same email and I send the proof of payment on their email address , now yesterday I receive an email saying that they have not received the requested documents and that they are closing my ticket and I did sent the proof of payment twice. All I want is my refund.