MTN is ripping customers airtime

I cancelled my contract due to incorrect billing hoping to port to another network. decided to check if the *****ing of my airtime persist by being a prepaid customer. to date i think i have lost more than R300 in a month as i load airtime almost every 2nd day. when i call MTN ducks and they keep on *****ing airtime from it's customers. people please help yourself get out of mtn network these are ********* who rob their customers since their billing ripping people and looks like they recovering money in this manner.