Nope, I have spent over 2000$ or more there, and I always get THE BEST service... same day shipping on most of my orders, etc...
You should contact the credit car company, as usually if these things occur it is because the address is somehow spelt differently, and it doesnt match up for the records... ELM STREET is not the same as ELM ST for computers, so you should have them spell it out for you, or check @ ur online banking site what the address they have on file is.
Also, you should call mp3car store if you have a problem, they are always very helpful, chances are your email didnt go through for some reason (or they replied and the answer didnt go through to you - spamfilter?)
I recieve nothing from MP3Car, I am just reporting my own experiences. If I have a good vendor experience I share it, if I have a bad one I share it too!