I would suggest what has happened is.....Gasman has turned pilot light off to test safety, hes then tried to relight it and the gas valve is not responding to 2 things, it could be the thermocouple that's faulty or the Gas valve.
My moneys on the Gas valve electro magnet not holding on. New Gas valve will be a simple fix.
If no joy from original bloke, then get another in to sort it.
Its no big deal. Good Luck
The OP is now saying the pilot WAS on, but the GF couldn't get it to fire, which rules out the TC or the EM. The boiler was then isolated. If the OP is accurate(!). So anew gas valbve could be a large wasr=te of cash. There is also the OH stat to consider..............., as well as the binding issue. As I said this si as easy as it gets. which is why I was asking if the OP has actualkly checked the guys credentials.
OP, you haven't said if the phone is a landline or mobile. I get so many messages on either that are useless, and cannot be understood. If the caller has allowed their number to be sent, I can call back - if it is withheld, then there is a punter thinking I do not care. A TEXT on the other hand, if sent to the right number is plain to see, as well as being some sort of evidence if a dispute about who said and did what ensues further down the line.