Bad customer service regarding my roaming complaint

I am so disgusted with Mtn that have not gotten back to me a MONTH after logging a complaint with their customer care department. Initialy Mtn's contract call centre agent Yusuf helped me with activating roaming. He explained charges will be higher but hell no not that high a charges which I received. It is ridiculous for the amount of time my cell phone was on and it happen all in *2 minutes*, me getting mtn sms my account is R700 then 30seconds later it is R1700 then again 30 seconds later R3700, it is ridiculous. I switched the damn phone off because by then I was heavily stressing. They really ruined my holiday and still want me to pay for it??? As far as me logging a complaint upon my return, I was helped very nicely with a agent sending an email to Chenille, Yusuf's manager about this issue seeing that he activated roaming, she then subsequently would get back to me, which have not happened up until this moment. I have phoned numerous times, no feedback, no conclusions. I just got center agents with attitudes, insising on putting me the client in my place it seems, not wanting or caring to hear about my frustrations or hear my side of the issue, which is really so ridiculous and even challenging me as to why I want to speak to a supervisor, I am shocked and grieved. I am so insulted and really so disgusted with Mtn service, this after being a loyal paying customer for 2 years. Never again. Funny enough now my contract comes to an end 1st December 2017 and I have to wonder if that is why they have this nonchalant rude attitude. After this debacle I would not advise anyone to join Mtn, unless you getting a kick out of bad service and abuse.