Contract query of mtn account

This is a continuation of my MTN contract query as I'm not yet satisfied with the response that I received. The Kimberley branch manager told me that I must be patient and they keep on debiting money on my account whereas the laptop and tablet are still in for repairs. And they have been in for repairs for more than a month and this is the fourth time they took them in for repairs. She also said they can't issue me with new merchandise and I have to do a follow up with the repair centre. I have tried to contact the repair centre but there was no response. I've really had enough of this problem so I need help.