Bad customer service at MTN

Good Day, i went to MTN Headoffice at 14 Avenue to Log a complaint on my number being issued to someone while im still in use of the number, to my surprise I received a bad service from the staff ,I went there to complain about my Mtn number that is in use by somebody else and not myself .The intire staff that was working at the office of MTN 14th avenue between 9:00 and 10:00 am, they where present when i went there to ask for assistance.Instead of them helping me, i was told that we SOUTH AFRICANS we dont read and what made me cross, the staff at present just laughed at me instead of helping.They where even talking behind desks and one of the office ladies called me a fool.The very same guy(Shad Kobane) he was not even wearing a musk as we were speaking. Shad Kobane is the manager and the service he gave me was absolutely bad. He made me felt like i did not know what i was doing there or talking about.he even said i must stop wasting their time as they have important matters to attend to. He(Shad Kobane,the Manager) even told me that i can even take the matter to to hellopeter or ICASA and nobody will touch him.