Easy to list you but when it comes to service that you pay for there is no such thing

Good day

i have 3 contracts with Telkom 2 of the 3 where on a separate invoice so i asked Telkom to merge my account in December 2018, after doing this i paid my account every month via debit order, in march i got a call from a dept collector telling me that i ow them money(they listed me on ITC), so after a month of investigating i was found that there was an outstanding amount on the account that was merged the, so i paid this amount in full, so i have spend more than 4hours in total on the line trying to get a letter stating that i have no dept with them, they are easy to list you but when it comes to giving a service they just dont give a # about us as they paying customer, i went into springs Mall store to get this resolved on the 22 of June 2019, just to be told that i have to wait until Tuesday, to this day i still have no answer from the store or the call center, i asked to speak to the store manager and he spoke to me then i asked for his area managers number and he refused to give me this info