incorrect billing that has not been addressed

this is the third time complaining regarding mtn incorrect billing but it seems mtn does not care because its money that they mad. where is the fair practices in all this if I as a customer am overbilled and I complain over 10 times and no one seems to care. where is customer care. I was overbilled for a total of 1400 and I have called the call center and I have complained here but no one at mtn seems to have any idea how to help me because I cant speak to billing and my complains always find themselves out of the system.<br>