Immature and Poor Level of Service from MTN Customer and Collections

I recently processed my monthly contract payment to MTN on the 12 November of R 74.39 of which R73.19 was the outstanding amount. I sent Mtn customer care an Email with the proof of payment explaining to them that I used my name as a reference instead of my MTN Contract number .Mtn then sent me reference number 1- ********** 5336 , they even sent me an SMS stating that the matter was resolved on the 13th November. I received an email on the 15th November stating that I haven't paid the R73.19.I sent an email to customer care again they sent me another Ref 1- ********** 4546. Today is 20th November , Mtn has suspended my mobile contract service, as a result I am unable to make or receive calls. Mtn collection and Customer Care are unprofessional. They are a big mobile company but yet they fail at what is so simple communication. There is no communication between their departments. For a company , a mobile company that has been in operation for many years. the level and standard of their service is immature , they have failed at even the easiest way to resolve such a simple problem . It is belittling that I had to write to hello Peter overran R73.19