Hey glajo,
I don't know who you went with, but you should have been made aware of the risk that this can happen.
I had actually read of this happening many times while researching pre-op, however, I was also made fully aware of all the risk by my clinic during the consultation. Infact, the risks were discussed at great length and included the risk of temp. and permanent loss of existing hair in the donor and receipt.
I'm sorry to hear about your experience.