MTN ****ING CUSTOMERS

I took a contract with my work November 2018 and chose MTN as a service provide. The contract was billing incorrectly and I started to query the matter in January 2019, I have been sent from pillar to post with no assistance and the worse thing is that my co-worker took out the exact contract and was going through this incorrect billing too. so when I enquired about mine I also included hers and to my surprise hers was corrected and the correct credit passed. to date am still trying to resolve this issue without success. MTN has handed me over and my name blacklisted in spite of my enquiring about this matter over and over again. I don’t know if this is a money making **** because no one at MTN seem to want to assist instead i get blamed for no wording correctly an email whenever am trying to follow up. My record is now bad and I cannot apply for anything. Can I please be given contacts of the ombudsman because i have tried everything even my work to intervene however not winning.