I would second Mamibear's advice and avoid making an issue out of this. If I were to use your approach, I would simply go to the manager responsible for the MOs and explain your position. My personal take is that this is a losing gambit.
I would rather just blow off the store for a certain period of time (at least several months) and then tentatively do some small amounts of MO purchase (single swipe, less that $500) to see if things are back up and running. Right now you are a marked man/woman but with high turnover, in several months you may just be another Joe Customer.