Compensation in terms of interest for delay period, Mental harassment,

The builder ‘BPTP Limited’ where I purchased the flat ,delayed the project beyond the maximum given time of 3.years. The builder ‘BPTP Limited’ delayed the project 3.25 years as per its own data while actually this project was delayed by more than 4 years. Even when the possession was offered , the builder increased the price in a big way from Rs. 2567655 to Rs.3030740.91.Builder even did not offer the compensation as per the Tripartite agreement though it was very less comparatively . In this situation I could not take possession. The Builder is charging 15% compound interest rate for delayed payment as can be seen in the documents sent by it. This is mentioned in the Tripartite agreement document too. My queries are if I do not take the possession then- 1.May I get the same interest rate 15% for delayed period as the builder is claiming on its little amount for delay along with some Mental Harassment and legal fee compensation ? 2. From when and till when?