Making profit from poor

So disappointed. I wrote complaint to hellow Peter about billing Dec. Mtn didn't respond. I even wrote complain to their complain department still I didn't get help. Mtn is making money from poor. Dec I was billed R2617.when i phoned i was told spend limit was not set.i phoned on the 24th. And it was confirm it's R0.I even went to the store to make sure that spent limit is set .the lady at Springs mall also said she changed the limit for me .even on my contract it R0 limit. For January bill R4480.I was shocked I nearly collapsed I phoned MTN lady nompumelo also confirmed that it show on the system that I request the spend limit to change.even today it was not changed because nompumelo said yo me it's still open Then she directed me how to do it .if o check from 17Dec to 24th MTN billed me money for data more that R3500 for data usage 7days. I m so angry because it proven that this consultant are not doing their jobs how on earth be billed R7090.So shocked. I even tried to phone complain dep now Lady Ayanda made me to hold 1902 min.without indicating if the at system is slow or up until air time finish. So Angry because it shows that no one is willing to help my last option is Ombardman.my id ***