Minutes went missing

I took out a telkom contract on the 24/10/2015 and I received 26 minutes which was the prorater of the 100 minutes which I should receive on a monthly basis. On 28/10/2015 I realised that my minutes were finished but I had only used 20 of the 26 that I received. I loged a case with the call centre case number: ***8 after the agent that assited confirmed that I have only used 20 minutes and she doesn't know what happened to the rest. I was told that I would receive feedback within 72 working hours upto this day I have not received feedback.I then receive an sms on the 14/11/15 stating that my case has been attended and I should contact the call centre, after contacting the call centre the agent arrogantly tells me that it now takes 21 working days to get feedback.This absolutely unacceptable I want my minutes because I will be billed for them. Over and above this when I took out this contract I was told that if telkom doesn't have reception in a specific area it would roam on the MTN network but they have failed to disclose that when telkom is roaming you are unable to receive calls from telkom landline as it says my number doesn't exist case ***2 also no feedback.