The green 'Available Today' was on recently and I made an enquiry. My message was read within ten minutes but then not responded to, leaving me sat waiting like a spare part.
Not half annoying when that happens.
ESAL
In situations like that ESAL, IMO you are entitled to start to make enquires of another SP. Then take the first one to answer.
Did this a short while ago in Leeds. To the two lasses who responded late, I explained that I had since agreed a meeting and always stick to prior commitments. There were actually very understanding and said they were impressed by my attitude and that I was welcome to book next time I was in Leeds.