When I did faults (quite recently
) we booked the first available appt, quite often we could book same day so even if a customer rang on Monday morning they could have someone out Monday afternoon. It all depends whats available to book but it may be possible that the next available appt may not be till Tues/Weds so Sunday opening may not mean a visit any quicker.
The quickest I ever heard of was my friend was chatting to a lady and had an appointment for the same morning, as luck would have it the tech was driving past the ladies road when he got the call so it turned out the tech was knocking on the customers door before she'd even put the phone down to faults
