You made this public yourself by posting on a public forum, instead of more direct and private means.
With the exception of the order placed in Dec, you have had decent service from MP3car, all other orders arrived within 7 days.
You stated it takes USPS two days to deliver from ship date, so your package should arrive Monday (14th) and by the lastest Tuesday, within 7 days.
If you are really upset with the fact that they (store staff) might have lied, then call them and talk directly to them.
So lets stop :deadhorse: and have a :grouphug: