From following these threads for quite awhile, my opinion is:
Those that follow the cs instructions from Hobby King (however dumb they may seem to be) usually get a resolution to the problem. (Sooner or much, much later)
HK seems to be very inflexible in handling problems, they have a procedure and that procedure must be followed....the t's must be crossed and the i's must be dotted.
Those that want to play by different rules always end up irate and disappointed. It's there way or the highway. The customer however can pull the plug and open a Paypal dispute if they don't want the parts.
Best of luck.
PS One other thing Andy, those store credits can't be used for shipping charges. Credits can only be used for item costs. Might not make sense but that's how it works.
To get money back, the customer needs to request that the $ be refunded/charged back to the funding source, otherwise they are turned into credits.