I take bookings by phone too and not by text, but I ask clients to text to confirm too. Mainly because I might be in another booking or getting ready for a booking so might not be able to answer my phone.  A couple of times guys have called to confirm when I have specifically asked them to text. I was quite annoyed one time this happened as the client kept trying to call when I was in another booking so I did not hear his call. If he had just texted like I said I could have just texted back after my other appointment to say see you later. Instead he left a voicemail but when I listened to the voicemail I couldn't hear what he was saying. I sent a message for him to text me back and he said he called me already and he was on his way, but ended up being a no show. I think he was annoyed I had not answered the phone and had texted instead.

Another time a guy called to confirm instead of texting and I was irritated but just said, oh I thought you were just going to text to confirm. It ended up being ok that time.

If you had a funny feeling about him on top of him not following your instructions then it was good you trusted your instincts.