Missing payments

I did work for my clients and made out invoices for the work done. I made a mistake with my account no<br> one no was short and the clients payed the money to that account all from ABSA to Standardbank now it is <br> more than a month and the money is still gone and ABSA say it is Standardbank and Standardbank say it is ABSA. The money went into a total wrong account and holder of that account spend the money.