I once had a so called "plumber" install two lever type taps in my bathroom to replace old ones that were leaking.
I was at work and when I returned home one tap was in the correct 180 degree position and one in a 90 degree position. Told the missus to call the guy and get him back to fix it.
Returned home the next day and no change. It's not possible was what the "plumber" (my arse) had told the missus.
Tell her to get him out again and show him the installation instructions. No change, not possible, the drawings are wrong.
She gets him back again but I'd told her how to fix the problem, just get the "plumber" (my arse) to unbolt the tap, rotate it 90 degrees herself and get the "plumber (my arse) to bolt it up again.
So 4 days later I get the taps installed correctly, something which I could have done myself if I'd had the tools.
There is no such thing as a plumber in Thailand.