MTN struggle to receive refund owed on cancelled contract

I paid my contract in full plus there was a surplus that needs to be refunded back to me. On the query for the refund I have received 3 different reference numbers just to drag out the process. I even had to provide proof of the payments (which was deducted from my account). There was two payments but they are requesting the sum of the two payments' proof of payment. I sent the two payments plus my statement 40 minutes after requested and 7 days after this another reference number was given because I didn't send the proof they want. This is it far the worst service received. Quick to take your money but when they owe you, you never receive it

Reference numbers received from MTN Please note we have submitted a refund request as per reference BO***. Kindly allow 3-5 working days for the request to b processed. 16 Sept Kindly note that a ticket BO*** has been logged for the credit to be allocated back into your bank account, allow a turn around time of 2 to 24 hours 17 Sept We logged new ticket BO*** with support as BO*** was closed due to no proof of payment not provided allow 72 working hours for investigation and feedback. 29 Sept