Yes, i would also complain. As a fellow pagan, i know how important these things can be. A mojo bag has just as much validity as any other religious symbol or object. If it was a matter of discarding it because they didn't know what to do with it after, they should've asked your consent first; if it's a matter of not respecting your spirituality, then they need to be schooled. Sadly, pagan faiths are not exactly respected (or even recognized) most of the time in mainstream culture.