Internal error from your side, now I am kept on hold

I was due an excess amount that i paid for an accident, which the insurance managed to claim back for me, they were supposed to refund me R3000 this month, after much back and forth between myself, my broker and the Legal Recoveries team manager at Momentum, we discovered that the broker had given the incorrect details to Momentum and the money was paid into an FNB account(we at this stage donot know whos account the money was paid to), but Momentum now want me to wait until they have gotten the monies back from whoever they paid it, and then only do they want to pay me, I had asked that they sort out their internal error out by themselves and refund me in the meantime, as I now have to be kept on hold till they sort out their error. All the other financial institutions asks for a bank statement to do a proper check to see that the account number that I am providing is indeed mine, but Momentum did not request this, i forwarded my "correct" bank details to the broker via message, and he forwarded other bank details to momentum, and momentum didn't do a check they just paid the money to that account, and now I must be kept on hold for their error, I would like my refund while they sort out their internal errors, I cannot be kept on hold while this is being done