Waiting 1 and a half year for a credit owed on my account

Since July 2020 I have been waiting on a resolution to a matter in which MTN owe me R447.99 which is in credit, due to their incorrect charges.

They have advised that the credit of R447.99 was passed on my account accordingly on 2021-02-11. However and their constant excuse is this was passed on my previous account (A***) before I was migrated over to the new billing system. MTN have logged a request with the banking team to transfer the credit sitting on the previous account and allocate this to my current account (BA***). Which has been going on for over a year.

I cannot believe I must wait so long for a resolution. What a total disgrace! I expect this credit on my next bill cycle please.

Reference Number: *** MTNSP query reference : *** New ticket ***