Consumer protection against broker

This question is regarding two UPI transactions of ₹9,500 (Transaction IDs: 504657282125 and 504657219966) made to Jatin Nagpal, a property broker, for a house rental agreement. I clearly stated that I needed the property for three months (Feb 28 – May 28, 2025). However, Jatin drafted an agreement with incorrect terms (starting Feb 20 and for 11 months) without my authorization. Despite this, he refuses to refund my money, citing a "non-refundable amount" scribbled on a receipt, and made me sign the receipt that too after payment. Even though no signed agreement exists. Additionally, he was uncooperative, failed to negotiate the brokerage as promised, and acted disrespectfully, stating, "I have been doing this business, so don’t teach me how things work. Now go and sign the deed." His behavior forced me to call the police (112). Given these issues, I no longer wish to proceed with him and request a full refund. As per the Delhi Rent Control Act, he must refund my money in case he failed to provide the agreed-upon service. I have supporting screenshots and documents for your reference. This agreement was made on February 17 feb (Monday), but I had clearly informed him on February 15 (Saturday) that I needed the apartment for three months. He disregarded my request and proceeded with incorrect terms, also told me rent will be firstly 16,000, he talked to owner and then made it 16,500, and after hidden charges of water which was never shared it became 17,000. Given his dishonesty and failure to fulfill our agreement, I sent him a legal notice on 7 april which he refused accepting after checking my name through india post. There is A LOT more of disrespect and dishonesty he has done, but right now can you please help me with the question, how strong my case is with the rent deed, payment receipt, and other similar documents.