Sorry to hear of your problem.
Autotrol, Clack, Erie, Fleck sell their products to their distributors. Those distributors sell to us dealers, like yours that went out of business and the one that charged you $250 to repair your Clack (I read that on another forum; he ripped you off unless he charged about $125 for a service call).
Those manufacturers can not legally sell to the end user, you. Any dealer selling any of those brands could get you the parts and warranty if the problem part was warranted; including the guy that fixed it for $250.
Distributors usually do not get involved with the end user (you) because again, they are not allowed to sell to 'you' or they elect not to.
If you can use a pair of channel lock type pliers and a small screw driver, you could have replaced all 5 parts on your Clack yourself and had the water back on in under 30 minutes; even if you have never done anything like that before. Had you called me I would have warranted any parts covered by the 5 year warranty and told you how to replace it as we spoke the phone.
What part(s) did he replace?