I brew beer and mead frequently and the type of yeast used is very inmportant. Several types beer yeasts will not make good mead as the alcohol content is too high (starting with too much sugar in the mix and cannot complete the converstion).
Did you use a yeast for mead (or champagne, which also works well)to begin with?
If your brewer adds the right yeast and jump starts the process it should still turn out ok. Mead does take a long time to convert and then smooth out, but it's so worth the wait.
Joe