you have a loan agreement with your friend, which includes a specified interest rate of 18% simple interest per annum. If your friend is contesting the interest rate, you may need to explore legal options to resolve the dispute. As the lender, you have the right to enforce the terms of the loan agreement, including the interest rate. However, selling the flat without your friend's consent or a court order may not be a straightforward process. In India, the SARFAESI Act, 2002, allows secured creditors (lenders) to enforce their security interest (mortgage) without intervention from the court. However, this act applies to specific financial institutions, and it's unclear if it applies to individual lenders like yourself. To avoid potential legal complications, consider the following steps: 1. Review the loan agreement: Ensure the agreement is clear, concise, and includes all necessary terms and conditions. 2. Communicate with your friend: Try to resolve the dispute amicably by discussing the interest rate and other terms. 3. Legal notice: Send a legal notice to your friend, reiterating the terms of the loan agreement and demanding payment. 4. Consult a lawyer: If your friend continues to contest the interest rate, consult a lawyer specializing in property and banking laws. They can guide you on the best course of action. 5. Court proceedings: If necessary, initiate court proceedings to enforce the loan agreement and recover the debt. Remember that legal processes can be lengthy and costly.