How to Communicate with Reeltors

I sell my own apartment. the first time. Advertising on popular websites. Calls from the routers are constant. I began to meet these brothers and sisters. They have one step - let's sign a contract for 3% of the value of the apartment (I have 100 thousand).

My question is, what are you going to do? Responsibility of the parties? Failure to fulfill obligations? They are serious about promoting on 60 sites, a federal customer base, successful deals, etc. And here I now (to try not to rust) listen to them carefully, clarify the details (this is important in the future, see below). And I declare, not hurry so, thoroughly - and I am ready to sign everything! My interlocutors are changing in the face (like a horse).

"But my small condition - if you sell an apartment, you get your commission of 100 thousand, and if in the course of 1 month there is no, then you have 30 thousand."

And here the circus begins - we don't work like that, we don't have such a contract, and you are a scammer. And here I already speak to them all their arguments (see above) about federal bases and successful experience.

I tell them, B$&T, their own words! No one agreed!!! to
Run all this x@eta down the stairs to jump!