My line has been closed for days, they have taken my payment but still state that I have an outstanding amount

My line has been closed for days, they have taken my payment but still state that I have an outstanding amount. I’ve logged a case for over a week and it’s still not resolved, to top it up, I’ve been calling their customer service and been on the waiting line for hours, only to be dropped twice by their agents pretending to be assisting me. I’m tired