failing to reflect my payment to my account coursing me to be disconnected repeatedly

i am very disappointed at mtn customer service. i made a payment for my account in march and accidentally typed wrong number as my reference.i have sent them countless emails with my proof of payment and explaining the situation but still not helped and they have not reflected the fund on my account. I find it odd because they can check with their banking records and see i did make the payment and allocate it to the right number becouse i have sent countless proof but yet i keep being disconnected for none payment. my compalint reference number is *** and my number is ***. i made payment to *** on the 25/03/2020 i still have the proof of payment. please help!!!