First, never, never, never, never, never (you get the idea) speak to the CA on the telephone.
Second, always, always (again, you get the idea) have any agreement in writing.
I know it is hard to believe, but CA's have been known not to keep their word. IMO, you have leverage. I would send a PFD letter to them and state in the letter that any further communications must be in writing.
If they try to call you, then do not let them get their name out before you say "I will only deal with you in writing, please send a letter stating your purpose" and then hang up.