Frustrated

MTN is not doing any justice for us as Customers,been going up and down to try and submit the paid up letter when you go to the nearest store they tell you they not a franchise store I must call the customer service department what's that? Now my credit score is affected because of a mere paid up letter that I need to submit and we don't even have the contact to contact to..because I keep on geting messages that I'm owing which is something I finished paying on the 15th of January and please advise your staff members with their attitude I mean you wake up in the morning and you tell yourself that you going to work..only to be rude to the customers ..MTN management intervene I want to submit my paid up letter so that my name can be cancelled into your system..what a poor service we get