Ummm I feel your pain mate. However if they said they can do the work in a time frame then that's it. You are not there to pay for them to learn. That is something they do in their own time with their own money. If they can't do the work, then don't take it on.
Do what I do. Mention you have the progress of the car posted on a website and they usually move their bums alittle.
Ever since the introduction of ricer crap there has been alot of tuners pop up that can't do what they promise unless it's plug in and play. I feel sorry for the old school guys who can do what they promise that loose business to guys with trendy names and skylines parked out front. Sorry, my 2 cents.