I was hired by a property management company in August of 2021 to do a mold assessment in NY and the unit was vacant from a hoarder and in terrible condition. I provided an insurance COI to the person who hired me and verbally told them I had a workers compensation exemption known as a CE200 as i am a sole proprietorship. I did the assessment and the $550.00 invoice was noit paid. After a few emails and texts to the Management agent over the course of 3 months or so I found the regional managers info and sent a payment delinquent request to which he respoinded that he needed an updated insurance Certificate. I sent a renewal copy even though the only reason it was not in the same renewal cycle due to them delaying payment. The regional manager responded the language on the COI was not correct so I had it made out exactly how he wanted it and provided a copy of the CE200. He has responded that all vendors are required to carry workmans compensation and does not want to pay me which has stressed me out and I want to know what I can do to be compensated. In addition I was not called upon to perform a clearance assessment and do not know if the management company performed the toxic mold clean up(I have laboratory results) or not for the new owner/renter. The person who referred me to this client is also a mold assessor and stated they are difficult to get paid from.