Billing frustration

I'm a very frustrated lady who have made numerous phone calls, send emails and visited MTN shops in Estcourt and Cascades in Pietermaritzburg without any success.<br> I've got 4 contracts on my name and 2 have been billed incorrectly for the past 4 months and 1 have been double charged for the upgrade in March. I was assured that if a R10 limit is put on each contract no extra charges will happen.<br> On top of all of this my son's phone after not even 2 months died to never come alive again. This phone have been handed in and they insisted I must give them the original box which we can't find. I asked them to send it in for repairs and I haven't heard from them since then. <br> We live 100 km from Pietermaritzburg and it's not that easy just to pop in to see what's going on.