OWING ME MONEY AND AN ABSOLUTE ****

my account was in arrears i caught it up but kept getting SMS stating i need to pay my account and i kept paying last month (MAY 2022) I went to my closes MTN branch where they informed me my account was closed and they owe me R2000 but they cant give me a refund for some odd reason since then i have been struggling to find out what is going on and how can i get a refund there was no help giving from MTN the query reference number they gave me *** and ***