Data charges

Tim at complaints management department notified me in the last correspondence with Mtn that my query has been sent to billing department but up to today I have not been contacted with anymore information regarding my enormous data bill. This has been going on for three months now. I have already received url reports from Mtn when I initially inquired about the charges but Still no one can give me any explanation about exactly what happened and why there are such exorbitant data charges on a phone that hardly has any apps on and where all updates are not set to automatically update. Please can someone contact me directly.