Standard bank froze our account in the name of confirming where it is coming from for over 72hours already

My husband app**** for his tax return on the 25th august and received his funda on the 27/28 august they paid the funds into his standard bank account which he had lost its card since he is now using different bank,he went to standard bank wanting to get a new card so he can use the funds and a lady who was assisting him said they are going to confirm first if the funds are from SARS and told him to wait for 48 hours that was on the 27 of august now the dont want to unfreez the account everyday we have been going to standard bank they keep telling us they are waiting for a confirmation letter from therlir headoffices Now what are we suppose to eat? Its been over 48 hours already can someone please help us Standard bank please unfreez the account we need money to buy food