POOR SERVICE FROM MTN LA LUCIA

I am receiving such poor service from the mtn store in La Lucia mall in Durban. Shireen messed up my contract she did not put a limit as I told her to on my data contract and she made a data contract open to calls, I only realized when I was slapped with a bill for R2500 which should've been R199. I then contacted the store went in circles to be credited. And again it happened. I am asking for Jerry to contact me from head office but he is not. Aqeelah from the branch said she will get a refund for me, it is going onto the 4th week with no positive feedback. She never answers calls, she keeps saying she's working on it and it is an amount of R2000. I'm actually disgusted of the service from MTN, I should have sent to MTN direct in UMHLANGA THE COASTLANDS BUILDING, SERVICE THERE IS AMAZING. I have asked Aqeelah why did she request my banking details if payment isn't done she says "didn't I just explain myself to you" I have been patient with her for the last 4 weeks.