I don't think they have a chance. If they have NO written agreement, they don't have anything.
Also it's great that you have the info from the second company that had to come and clean up after them.
I think the first step would be to send the CA a DV letter (be sure to send it CMRR). See what they come up with for proof. I doubt they have anything.
Give them 30 days to respond.
Be sure to come back and update this thread. I'm curious to see what their answer is.
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