Over charged

I have been over charged for calls and data for the past couple months. The joke is that 1. I have often not had mobile data coverage in the past 3 months (MTN told me it was due to the strikes) but my usage went up? 2. This past weekend I tested it by only using wifi at home and my mobile data usage is the highest yet. I further redeemed loyalty points for the first time this year and looks like I was actually charged for it. After being a loyal business customer since 2000, with multiple lines, we have now purchased other contracts and waiting for the MTN to ride out their term.