R600 missing from capitec account

It is a long weekend and inconveniences like this are not welcomed.. My brother just deposited R1000 in to my mother's account a few minutes ago, and only R400 is available and the whole R600 went AWOL. And I can guess what is this all about.. three weeks someone deposited R600 into her account by mistake and my mother went to enquire at Capitec Temba, who the depositor was and got no help. Subsequent to that several people phoned her claiming the money and we were wondering if these callers were the depositor did the bank give them the cell it was quiet odd. She then was phoned by someone who claimed she was Capitec employee and told her she was going to freeze her account and all that. On Saturday 5 March 2016 we went to Capitec Centurion to make further enquiries, the consultant who assisted checked and saw the R600 was there but not accessible we then asked to reverse the money back to the depositor. Now it looks like every time we send her money you hold R600.00, was the HOLD not supposed to be removed after the reversal. please someone sort this out, it is sheer inconvenience..