Payment for Incomplete Work

I asked a person who handles all the necessary forms for rental assistance for the homeless, and the agreement was that when the money starts coming in, he would receive the first two months. During the process, before the money started coming in, I told him that in the end, I am not interested, and he claims that after all, he did his work and prepared all the necessary forms for me, and therefore I need to pay him the amount for two months, even though I ultimately am not doing it. The reasons I ultimately decided not to do it are: a. Because there was a stage where he mistakenly gave me a form that could have complicated things, and I noticed it at the last moment and did not send it. b. Because now I have been informed that they want to send an investigator to my home to check that the data is correct, and I do not want to lie, and he did not inform me from the beginning that this is how it should be, and he claims that it is something new that he did not know about initially.

Shalom and blessings 

The answer of the Beit Hora'ah judges:

Payment is required. Everyone knows that there is a cost for rental assistance...