Missing funds

On the 31/12/24 I was transferring R5 300 from my Old Mutual money account to my Nedbank cheque account, I accidentally punched in a card number instead of my Nedbank account number. Eleven months later , I’m still struggling to get my money back , I have been to three different Old Mutual branches namely Scottburgh branch ,Port shepstone branch and Durban branch asking for assistance with no luck, I was told that the money might be at Nedbank of which it not there, and it could never be there since the account number was wrong. I feel that my money is still stuck somewhere at Old Mutual Bank and I don’t understand why is it such a hassle to return my money back to my account. I feel ****** by OM bank