Agree to some of them...set up a meeting place that's inconvenient to them like a Walmart on the other side of town, and tell them you're in the white pickup truck.
I had a guy threaten to murder me once after he searched Walmart for the right vehicle for half an hour...all while I was 200 miles away.
Yes, lie to them then waste their time.
After all, they really damaged you by trying to buy your product for less.