When my bike was built they didn't cut the fork, and told me to just ride it and bring it back after I was sure with my position. In the end I decided not to have it cut even though my stem is not at the highest position. I think it just gives me more adjustablity which someday I might want. But mimi, if it is going to take weeks for them to get a new one, perhaps you could take it back and ride it and then just bring it in when the fork fork arrives for a quick change out. After their error they should be willing to work with you on this. Do you know you can also put an extension piece on your steerer tube to give it more height. It adds weight and isn't the prettiest solution, but perhaps they could do this while you are waiting for the new fork, or you could do it to see if it solves the problem before investing in a new fork.