I haven't needed a tech repair in years, but I have had to deal with repair people in my house who lie. We rent a house, so we have to call the property manager before any repairs can happen. They inevitably go like this:
Repair person shows up unannounced when nobody's home. I get a call at work saying, "I'm standing outside your door, but nobody's answering." I then say, "Yeah, well the property manager said you'd call to set up a time, but you never did that, so I didn't know you were coming." Often at this point they start lying. "Well, I called, but nobody answered." No you didn't. I have caller ID and voicemail. I'm not an idiot.
We reschedule and they come back to do the repair. They show up, figure out what the problem is, then say, "Oh, I... uh... need a part. I have to run to home depot to get it. I'll be back in 20 minutes." 3 hours later I'm on the phone with the property manager explaining that they came and looked at the problem, then left and never returned. Every. God. Damn. Time.
When they finally do show up to do the work, you better hope it doesn't take more than a day to complete. If it does, you get the, "I'll be back tomorrow to finish this up..." and 3 weeks later you still have a hole in your ceiling, or whatever. What is wrong with these people? If you aren't sure that you'll actually be back the next day, say that! If you're sure you will be, then something comes up tomorrow, just give me a freakin' call to let me know! Is it really that hard?