Possible furnace scam? Please judge for me
I just did my regular furnace service and this is the first time I use this company. The heat exchanger has been doing ok, although the furnace is a little old. In the last inspection, no cracks was reported. This time, however, the furnace guy used a digital device and stuck it on the housing of the furnace and told me there's a slight crack. Prior to showing me this, I saw that he was hammering something. Does furnace cleaning and inspection involve hammer at all? Is it possible that he hammered on the weaker, rusty area on the heat exchanger to create some slight crack?
Also, after he left, and I'm not sure for how long, the furnace stopped working (or maybe it didn't work when he left, I don't know because it was kind of warm that day so I was unaware if the furnace kicked in) During that night, I was already suspecting the furnace was not kicking in but I didn't spend time on finding it out. And the next morning, it was very sure that the furnace stopped working because temperature dropped to 55 and there's no heat. I called the company again, they sent out the same guy. That guy probably spent 5 minutes on it and told me that the low volt wire outside the furnace was broken. He didn't show me ANY broken wire, nor showed me anything "fixed". In the report, he mentioned that "wire required", I'm assuming he meant new wire required. And I checked over the wires and I didn't see any signs that any wire has been newly replaced or taped. The wires just looked as they were before. That guy ended up charged me $50 for this 5-minute work and claimed that it's because of broken wire that he has to charge me.
Few questions came to my mind after he left:
1) why didn't he tell me it's broken wire until everything is "fixed"? He could say whatever it was and made me pay for it?
2) why didn't he show me any "residue" or evidence of the broken wire?
3) why did he write 1.5 hours of work on the report while the work, whatever it actually was, took him only 5 minutes?
4) why I'm not seeing any new or taped wire?
5) why a short never happened if the wire was broken?
I do not know anything about electrics, not to mention furnace. Please forgive me if I sound stupid in any way. But I'm feeling very uncomfortable about what this furnace guy has done and I'd really appreciate any input before I take any action.
Thank you so much!!