Airtime forfeited

I renewed my contract with MTN in June 2015. I upgraded the contract and was advised by one of consultants that my current airtime would be carried over. The airtime was only carried over for one day and then it was forfeited. The amount was R350 worth of airtime My husband called MTN and was advised that the staff were on strike. He has been calling almost everyday and there is no resolution. Today he went to the Bayside Mall branch waited 30 minutes to be attended to and was advised by Jacky Van Harte that there is nothing she can do and that the consultant that assisted me with the renewal is away for a month on leave and the issue cannot be resolved. This is totally unacceptable. I think this a breach of my contract. I would not have upgraded if I knew that I would lose the airtime. Someone needs to resolve this