Refund amount over cancellation of under construction Property

This is regarding a Refund amount over cancellation of under construction Property: I am from Chennai, and I have purchased a flat in Chennai in 2018. As per initial agreement, he must hand over the property in 2020. Of course, there was delay in property hand over, I have cancelled the property.For cancellation they did not charge extra. However they have imposed Tax charges. And they have paid 80% of the amount as I need to clear my home loan and hand over the documents(Sale and Construction agreement) for remaining 20% of the amount.I have cleared my home loan and got my documents. They are saying hand over documents, we will pay the balance after 2 weeks. I got suspicious and asked them You pay 20% and take the documents.Its more than 2 months they did not respond anything how every they have sold the property to other customer. Can You raise a dispute with the Sale and Construction agreement. And also for cancellation are there any Tax deductions applicableNeed your advice on Refund amount over cancellation of under construction Property. Meanwhile, how to approach the builder for my balance amount. Also how can I recover the amount that has been deducted as a tax reasonPopular Questions:http://103.133.215.241/lawyerchennai/legal-consultation/property-issue-regarding/http://103.133.215.241/lawyerchennai/legal-consultation/refusing-to-marry/http://103.133.215.241/lawyerchennai/legal-consultation/kidnapping-kolaimirattal/