MTN Can’t Give Me My Account Balance

I have been trying to get my SIM card reactivated, and as I’ve been overseas, would like an account balance. Beginning in April, I have phoned, sent numerous emails and visited 2 branches. Each time I am told I will receive a mail within 24 hours which does not materialize. This has been frustrating as I have been unable to make any calls during this period. I am desperate to settle my account and reactivate my SIM card but unfortunately, nobody has been able to assist me.