Excessive Billing

I have been overcharged for my two contracts I have with MTN and every month a call has to be logged. Nonsense. I took additional contact for data(Made for me Home 120GB) which was suppossed to be 269pm and with existing one for R299 I am instead being charged over R900 combined. Can somebody in billing or whatever the **** they may be do their ****ing job and fix this nonsense?