MTN non Competency

I have had numerous problems regarding my contract account, there is constant problems regarding my method of payments were its change from Debit order to Cash without my permission, also when called and discussed with agents from the customer care regarding my account, all is said and changed regarding my account payments and date for deduction but yet nothing was actioned on their system and therefore i am left on the short stick. MTN just does what they want instead of following instructions that were said over the phone with 1 of their employees and then my network is blocked due to non competency. Constant dissatisfaction and a constant trouble.