Incorrect fees deducted

On the 3rd of November, My husband had given notice for an investment to be released. The nature of this was due to unforeseen circumstances. Proof of this was provided to Nedbank Brooklyn Pta. My husband has signed the relevant documents at Brooklyn branch on the 3rd and was informed that there would be a penalty fee of R9600 for the early release. This was agreed to and signed by my husband. The funds were released into my husbands account on the 6th of November. Only to discover that the penalty fee taken was R34500 and not R9600. Brooklyn branch manager has been very helpful, however I was told that the matter could take up to 4 weeks for a resolution. This is certainly unacceptable and the bank cannot make their problem ours. I want the R24900 to be returned to my husbands account immediately. The error is with the bank and not with us. I need this matter to be resolved immediately.