I called to see about them coming out to check my ...

I called to see about them coming out to check my tankless water heater. The service guys came out and said "is their any codes that popped up on your screen" I said no there has not been any. Then he said "well we do not work on this brand anyway, but I can flush it out for $300 on monday, well if you do not service this brand why would i want you to flush it for $300.That was a short version of our conversation. My whole point is, when you call and ask for a service on a product like, let's say a tankless water heater, you should ask what brand, that way instead of finding out when they get here, that they do not service that brand. It was a waste of my time and theirs