I have no idea where to begin. Plumbers who can't fix, what I believe is basic plumbing jobs. Subcontracts to other companies that are not authorized. Office manager will not call you back. Company wont answer emails.
If you can find another company - do it.
If you have to use them for AHS. Be sure you get the plumbers number. Make sure the work is authorized. Don't allow them to bring in a subcontractor without prior authorization. Make sure you know what repairs are involved and what exact work was done. Keep account of the time the plumber is at your house and what was done.
Overall I wouldn't use them if I was paying for it myself