Harassment drom NUDEBT

This is outrageous. For more than a month now ive paid my accounts in full by mtn and up till now theyr dumb ass debt collecting company has been harassing me to pay my bill. Ive spoken to customer care and till date no problems are resolved. I getting fed up with this constant harassment. I starting to lose it with mtn and im on a path of canceling my services and move to a betrer service provider.