NRI Seller -tds not deducted

Can someone please help.

A senior citizen (nri) sold his property in India recently worth Rs. 15lacs. He account was credited with the entire sale price and no tds was deducted by the buyer. 

1) should've the buyer deducted 20% plus surcharge?

2) what can the seller do now. Should he pay this tds himself, if yes.  What is the procedure?