All Systems Air Conditioning and Heating

We’ve used All-​Systems in the past without issue, but this time is turning into a nightmare.
We had them out a few weeks ago and were told that our unit was fine, but then it started throwing sparks yesterday and tripped our circuit breaker, so we called them again. The tech couldn’t come until after-​hours, but I was told that if the problem turned out to be something that the previous tech should have caught there would be no charge, so we told them to send him anyway.
We asked for a diagnostic visit – we wanted him to tell us what was wrong and how much it would cost to fix it – but the tech apparently decided on his own that he was here to FIX the unit. He figured out the problem in the first few minutes, pulled the blower motor out, typed for awhile and then asked me to approve the repair. I told him I couldn’t do that unless it was under warranty – he said it wasn’t, even though I’d thought it was – and he asked me if I wanted him to put the unit back together or just leave the motor out so we could keep the cost to the cost of a service call. I told him I couldn’t really afford the service call itself, since I was going to have to pay my home owner’s warranty company to send someone the next day, so I certainly couldn’t pay any extra tonight, and he took the blower motor out to the back porch and left it.
Can somebody please tell me: in what world is it okay for a tech to go on a diagnostic call and START A REPAIR WITHOUT PERMISSION, and then tell the homeowner that there will be an extra charge to put things back how they were when he arrived?
All-​Systems says they can send a tech to put the broken blower back in, but they’re going to charge us for it. Gee, umm. thanks?
Oh, and bonus: the company our homeowner’s warranty is sending out can’t diagnosis the system until it’s put back together, so we can either pay them twice or pay All-​Systems more money for completing the job they weren’t supposed to start. Thanks, All-​Systems…