Tds correction

My client has sold the property on  6th April 2017 as per sales deed. But the buyer mentioned transaction date 28 March in TDS return so TDS amount is getting reflected in 26 AS of  A.Y. 2017-18 whereas sales happened in A.Y. 2018-19. Now I have two options.

1. Show the sale in A.Y. 2017-18 or

2. Tell the buyer to revise TDS return.

What should I do? Please advice.