I ordered an RMD a few months ago and had problems with my payment being rejected as well. I got an email that I needed to redo the paypal funds, so I contacted rat customer service because I feared a scam (NOT by swamprat, mind you, thought maybe a hacker). They did contact me and, indeed, the order had failed due to some kind of computer glitch. I got back into paypal and sent the funds (to busse, I think) as instructed and it went on through.
I ordered a RS more recently and it went through w/o a hitch. I think Trissy from customer service helped me with the RS. Can't remember who on the RMD, but they were helpful even though it was somewhat inconvenient to wait to be contacted. I can understand your frustration especially if you have sent more emails. Maybe they are backed up with the holidays or helping with the santa ganza. I know that I saw Garth post over on busse that he was pulling people off of the production line to help with the ganza shipping.