Wrong Credit Note showing in my GST2A ,do I need to reverse ITC for same in my 3B ?

You cannot edit GSTR-2A directly. Your first step is to demand the supplier rectify the error in their next GSTR-1 filing. If the credit note is truly invalid (i.e., no goods were returned or discounts received), you are generally not required to reverse your ITC, but you should maintain a detailed reconciliation statement and records of your correspondence with the supplier to justify your position in case of future tax scrutiny.