Refund of TDS

Hello everyone....One of my client providing business of Security Agency. He had received payment in A.Y 2014-15 from the company & TDS has been deducted by the said co. while making payment. At that time Co. has not deposited the said TDS amount to the govt. ITR has been filled for A.Y 2014-15 & the said TDS amount was shown in ITR. Later on, I came to know that there is Tax credit mismatch for such A.Y. I advised my client to kindly write an application to company for TDS issue. The co. has deposited the said TDS amount to govt. Now, my question is that whether I can refund that TDS amount for such A.Y as Return has been filled already? Also while filling return his bank a/c no. was wrongly mentioned. Now, when go to Service request for change in ITR particulars, the E- filling website not allow me for such change as it says time had expired. What I can do now as the TDS refund amount is RS. 50,000/-.