Mtn contract line stopped working suddenly

I'm very disappointed with the service my Father received from MTN. My younger sisters' phone MTN line just stopped working while my Dad pays thousands of Rands for a contract for MTN. My whole family is using this network and my dad has been given the run around by sales personnel that don't know how to fix the problem. This is what he even wrote to one guy that normally helps with with upgrades 'My daughter's phone is not working ***. We first went to MTN Cavendish, and we were told that we should go to istore. The intolerant guys sent us back to MTN. We were advised to get a sim swap. It didn't work. We went back to istore . A lovely engineer put the phone to all tests under the sun and found no fault. Last Sunday I visited your store hoping to see you.I met a lovely tall guy who tried to help me but couldn't. He asked us to go to the Century City MTN, of which we did. We met again a lovely lady who tried to help us. She told us that she has sent an email to what i would call " u nlocking place," and we must wait for 72 hours, and all our problems will be solved, which was Wednesday last week. We are still waiting.' Regards, Mvuyo Macanda

I don't think this network deserves his money. Can you just fix the problem already!!!!