Is this exactly what he said, or is this your understanding of what he said? Something may be lost in translation, here.
This is exactly why I response in earlier post. The tech is not here to defend himself. It is only the owner's words (not saying she is lying). But she said "I Think My A/CContractor Ripped Me off--Help!" and judge for yourself.
I who don't like anyone accused another person ripping someone off AND he/she is not present to defend him/herself. And I think we should not charm in this post to aid this OP.