Poor customer service

I have had absolutely ******* customer service from MTN SA ,from being debited within a short space of time on ky initial start of the home business wifi to being cut of monthly for the last 3 months because of funds in my account. Why do you send an sms with the due date for payment ans cut services that are contradicting your sms .staff ans managers are not helpful at the customer service department. Im being owed so many days of internet and there is no accountability .