Sometimes people are busy
Sometimes people make mistakes
We're ALL Human Beings (I think!)
Slap on the wrists and a "don't do it again" from the boss, an apology from the employee to the customer for not getting back in the agreed time scale... What's the problem there?
It's no different working in a bike shop to any other industry where you have a customer. Sometimes you have busy days where you never get round to doing loads of things you were supposed to (and sometimes customers suffer as a result, even if it is only a mild inconvenience such as this), other days you're sat on your arse, bored, with no customers at all!
Wouldn't happen in my shop.
If you think that's the case, you're VERY VERY naieve... Even with all the best will in the world, Human Beings still make mistakes from time to time...
Ton, give em a call back in the morning, say "sorry to bother you, I was expecting a price back on a build yesterday afternoon, any chance it has been done yet?"... You'll probably be greeted by a slightly embarrassed person on the phone, with a price (or price soon to be sorted), an apology and maybe a couple of quid off as a result...
I think to take your business elsewhere just because someone forgot to call you back with a price in the agreed timescale is a bit ridiculous to be quite honest!