Excess tds charged.

A person deposit FD in bank. He give his pan to bank. But bank fail to attach the pan and charge tds 20 on income.His slab is actually 10 .Is refund available?It happended 4 yrs ago..ITR were failed on date. The FD for 5 yr. he calim the total amount with intrst. 300000 on aug 2015.Total amount is 900000