Gurgaon broker threats

We are planning to shift in next month and were in thr middle of house hunting. After getting a flat through one of our contacts, we directly got in touch with the flat owner. now for 2 days we've been receiving threat calls from Gurgaon brokers. What the heck is wrong with them? We've blocked many, but they are saying about coming to the house on shifting day and also asking for brokerage. We've blocked many of them. Should this be taken seriously?