sir, I booked a 1BHK flat on 07-12-2018 with Token amount Rs-5000 Chq to Builder, Now I have loan S

sir, I booked a 1BHK flat on 07-12-2018 with Token amount Rs-5000 Chq to Builder, Now I have loan Sectioned and Approved later From PNB Housing finance Chq Dated 06-06-2019 for Payment of Remaining amount to builder, on the basis of Home loan Chq Copy They made a Sales deed and regeneration on 12-06-2019 .Now seller(Builder) is Refusing to Give that orignal Sale deed documents to me For Submission to Bank for Acquiring Home loan chq. Without original documents Bank will not Give me Chq of Home loan for payment towards builder and unfortunately soon Validity of that (Home loan sectioned) Chq will expire in 25 Day's. after then builder can sue on me for non-submissition of payment chq and then i will not have any rights on That properties (Automatically). This is one kind of blackmail because builder is demanding 107000/Rs GST amount in Cash and advance, only after then He Release that registered documents for Bank submission . Help me