lost air time

I recently took an upgrade with cell c and when that upgrade kicks in I got an sms notifying me that my upgrade has been successful upgrade that was on the 2nd of November, Two hours later I realised that my air(minutes) is finished,Then I called customer care and explain to them what happened and I was promised that a call will be logged and someone will get back to me within 72 hours that was on 2nd of November ,to my surprise no one called me to explain what happened m still waiting for them to get back to me.And when I call the call centre client care I speak to rude consultant of which they cut your call or put you on hold for long. :(