Poor Recall Service

I have been struggling for months now to get my funds back from Standard Bank which was paid via EFT from Nedbank. I made two payments...one was paid back. Standard Bank added an extra number on the second account number which ended up in another Standard Bank account holders name. Last week Nedbank deducted dubble the amount from my account for recall services. I phoned them...they said they can see they owe me the extra money back. I mailed them...and I am still waiting. Now...nor Nedbank nor Standard bank can sort this out for me. Standard Bank gave me the wrong info as to what account number is should use so both payments ended up in wrong accounts. Is there something I can do?