Money back

I haven't received any feedback from mtn and not happy coz this month also got my invoice and which was extra by 30 rand and called in to complain about it and still didn't get answers I'm not really happy about mtn ,coz even my last month issues were not resolved instead my line was closed for 3 weeks so it's either they way or not way,I had a problem with mtn from the minute I was signing up