FNB withholding Funds from SARS!!!!!

Absolutely shocking from FNB. My Tax Refund was paid into my account from SARS but after 1 day I was unable to make a withdrawal. I contacted FNB who said that SARS was holding the money back. After going into SARS they informed that it was not from them and that they had issued an completion letter. I returned to FNB who offered me no assistance only telling me that I need to go back to SARS. I have now been told that this is not an isolated incident and that FNB has done this on more than one occasion.