1) They had a 60% off sale, I'm sure they ARE overwhelmed. The sale started way before you ordered, so you probably ordered later than many people.
2) If you look in their vendor topic here on ECF, reps were there and have been there, steadily replying to customers here from the 22nd-28th. They said they were crazy busy, too....sale went all the way
thru til Cyber Monday
3) Most people, whether in business or not, DO take off time during holidays to spend time with family and friends
during a long holiday weekend. I did not expect all vendors to work feverishly thru the holidays ....but that's just me.

I kind of value observing holidays and down time, since it appears there is very little of that anymore, and when there is, people complain.
4) FWIW, email communications to me have been excellent, and have been told my order has shipped but I ordered a day before you did
I just don't count days the same way over a busy holiday weekend as I would during a normal business week. So I'm sure your order will be forthcoming soon.
One vendor DID ship the day they received my order, but I still don't have it. So, I guess things weren't real quick at the USPS either, since they don't work on Thanksgiving either. I exxpect i will get my Mr.
vape order before I get the order from the other vendor, who by the way, is well-known on ECF for being top-notch. So I'm sure it's the holiday thing.