Bank does not honour agreement after investigation.

Due to an error on the side of Standard Bank an incorrect debit order was placed on my Revolving credit account. An investigation was carried out after the bank blocked my account. It was found in my favour that I have not defaulted. It was agreed that my account would be unblocked, re-activated and become available for my use again. The correct instalment has now been deducted from my account for the last four months. However, the bank did not honour the side of the finding that my acccount would be re-activated. It has not been activated since then even though the bank is deducting the correct instalment. All my email correspondence is now ignored and when I do get hold of individuals employed by the bank, the promise to rectify my account but once the call ends, nothing happens thereafter.