PAYMENT DONE BUT NOT PROCESSED

I have never had problems with MTN but this month it is insane, I paid my account from Tyme Bank on 03/03/2022 at 16:46 and did an immediate payments that costed me R14. Since I have not receive an accounts for the last couple of months, I paid an amount of R500.00. On 11 March I received an sms saying my account was blocked due to non payment. I contacted MTN via Facebook and chatted to Xolani. I explained to her about the payment and uploaded the proof of payment so she can see. She opened the account. I then tried to upgrade but it was denied. I went to one of the MTN outlets (at Oakfields in Benoni) to upgrade but again I waas told my account is in arears. I sent them the proof of payment and they opened a ticket (whatever that means). This morning (a miracle) I received an email with my account. The outstanding balance is R358.24 BUT MY PAYMENT OF R500.00 IS STILL NOT REFLECTING! What is going on at MTN? Are people not ding their jobs? I phoned 135 this morning, again explaining that I did pay, when and what time. I spoke to Busisiwe who said she will email her contact details so I can send the proof of payment and she will process it immediately on my account. The next moment she puts the phone down in my ear. This was 10:30. Up to now no email, no response whatsoever. I cannot believe after being a customer of MTN for over 12 years they treat me like this. I am very disappointed and would like to know how do I sort this out.