Horrible MTN Customer Service and useless systems

I had a home Router with them paid them on the regular until i wasn't happy with the service and they said i should take it back to one of the stores ,but then they carried on billing me and till today that account shows up on my credit profile as an account with a balance that affects my credit score .

Fast forward i call the customer service center spoke to a lady who gave me a Name as Unathi and said because of Popia act she couldn't give me her Surname. Now my biggest issue now is that i was asked a bunch of supposedly authentication questions of which i failed . When i ask which did i fail they then say the system does not show ,which question i failed now this is an inconvenience such systems should be looked at because if i was helping someone there has to be a solution to the problem, which they don't care about they just say well that's just the way it is . Customer service from MTN is very very poor.

Maybe they just don't care about the effect their actions have on the public but who is going to fight for us?