No action or feedback on query

My services for outgoing calls have been suspended on a monthly basis despite having 6 hours of airtime available . MTN has imposed a credit limit that is almost the same as my subscription amount. No one can fix this and I have to call monthly to have the service reinstated. I was promised feedback from Michelle who stated that this case was being dealt with by Baldwin ( her manager) and I would get feedback the next day. Nothing has happened.