Wrong assessment year mentioned in tds return

Reuest your customer to file the revised tds return so that your company will get the credit of TDS deducted otherwilse it will not appear in Form 26AS.

IT Dept. will not give the credit until and unless it appears against your company PAN.

Your company will claim in IT return but the same amount of TDS will require to be appear in their ( CPC) database. 

So better, request your customer to rectify the same and file the revise return.

It is easy and less expenive.