Poor service

I paid an amount of R150 000.00 on the 17/03/2018 to my Nedbank bond and I erroneously used the reference number instead of the account number, I found out after 3 days that I haven't paid it into Nedbank home loans and I went to Capitec and I was promised that this will be reversed within 14days and I went again on the 12/04/2018 to Capitec branch in Guguletu and I was told to wait for Monday the 16th of April it will appear in my account up to today the 18th of April it is still not been paid back to my account. today it is the beginning of the 2nd month the money is still somewhere at Capitec and accumulating interest for them I don't know what I must do for them to pay my money back - the service that I received in their branch made me make a decision that I will have to close my account