Came to our house to give estimate on remediation ...

Came to our house to give estimate on remediation work due to flooding. Gave us estimate and told us no down payment - would collect payment once work was finished. We agreed and expected him back the next day to complete paperwork & start work. He never showed for appointment. We left numerous messages and did not receive a return call. The next day someone he works with showed up and demanded $6,000 before they would start work on the house. We refused and the guy proceeded to use foul language and peeled out of the driveway. Not sure what is going on with this company, but there is definitely bait & switch going on, and who knows if they would even do the work once they received money. I do NOT trust them - I advise to RUN and do not stop for anything they are selling.