Flirting

How to address contractor continuously flirting?

I currently have a situation where a contractor working on my house gave me a bid for 3 jobs, and I only wanted to move forward with 2 of them for now based on the cost. He decided to throw in the 3rd job for free, even though it was quoted at $700, because I'm "really cute". I politely declined the discount because I've experienced the "free stuff" scenario enough to know that it is always followed by a persistent attempt to get a phone number/date. However, he insisted that he do the job since he's working at the house anyway. The problem is that the contractor has now started sending me personal texts during the day, saying "Dang, you left for work early. Hope you don't have a bad day since you didn't get to see me!" I just ignored it because we're both supposed to be working, and it came across as very unprofessional. He also texted me "oops" yesterday, and when I called him in a panic, he laughed and said he was just pulling a prank to get my attention.

I have used this contractor before, and he does great work. I just wonder if there is a way that I can kindly get him back into a professional mode without ruining the contractor/client relationship. Any ideas?
How to address contractor continuously flirting?
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