NO FEEDBACK ON CONTRACT RENEWAL

On 2nd June 2015, I went into MTN to upgrade my contract, I was informed by the consultant helping me that the credit reflecting on my account is R 370, however what should have reflected was R 2900. He assured me that this was a discrepancy on their side as MTN and they would work towards fixing this and would call me within a week. A week later I wasn't called, I went back in store and was told they were waiting on MTN head office to correct the error. Its almost end June and I'm still waiting on this to be corrected! I need a new phone and as a loyal MTN customer I'd like to stay with MTN, but they are making it hard for me. Plsease Help me soon!!!!