Mtn poor sevice disappointed business line poor

I'vie complained endlessly to almost all the consultants with regards to my lost air time. I'v lost many clients in pass 5 months and absolutely no one in the technical areas could detect were my airtime was. All Internet and application were switch off and still airtime would be used. Dis satisfied and unhappy customer loss of business. Mtn has to improve there service with regards to there call centre , network and technical department. I'm very upset with the fact that I'm now unable to load air time since Mtn never knows were and what happens to my air time.