Account still suspended 4 weeks after payment was made.

I have a mobile contract with MTN. My my line was suspended due to an overdue account however payment was made at the MTN store on 27/07/2017 and the line is still suspended. Ive been in store twice since then and also called in however still haven't gotten any response. Ive been told that they are waiting on another department to reply however im failing to understand why its taken 4 weeks thus far. I understand that my provider has the right to suspend my line if payment isn't made but suspension for 4 weeks !? Due to poor internal communication.