Trusting others for an item transfer

[Polixa]

Suppose another player agrees to help you transfer an item, something really big-ticket (50kpp+), and they don't follow through?

Would customer support drop everything to help you out or would you be s.o.l. ?

I always drop transfer but thinking maybe I'm being too paranoid. I know standard advice is to choose a L60 with a big-name guild but still...