I have a similar story which may or may not have the same conclusion. About 8 or 9 years ago, I ordered from HoB as well, payment was accepted, and went a full week without a response. I sent them a follow-up email as to whether or not they were still a viable business, and if there was to be a delay, common business practice would be to notify the buyer. A few days later, I received a VERY hostile reply; probably the most a**holish email I have EVER received from a "business". "He" said that he had been moving his daughter (?) across the country to begin college, there was some other personal drama going on, and that my package would be sent when he returned. He also said something to the effect that he was not a large corporate business with front office staff and phone workers. My items arrived about a week later.
I was not as upset as you might think because I learned some very valuable insight as a result of this, especially from Paul Weir (RIP) here on GS. ASL TPP are not brick and mortar businesses with fully staffed offices working fulltime. In HoB's case, it is basically one (?) guy retaining the rights to the publications, keeping them stocked and selling them via a website. Who knows the original print runs, but he may even have had to have some reprinted. BFP, LFT, ESG, LCP etc, are/were all basically the same, except that they have a handful of partners who get items to customers. HoB has one family man trying to sate some of our insane ASL cravings. Someone can correct me if I'm wrong, but I believe over at BFP that Sam Tyson is almost single-handedly responsible for internet order fulfillment. BFP is a much more voluminous heavy-hitter than HoB, and one can imagine the ordering turmoil if Sam had a personal/family drama going on. IIRC, George personally does all of LCP's sales as well.
Sorry to be so longwinded, but probably like you, I hold in general that any internet business should be prompt with sales and replies. As one of my first forays into TPPs, HoB showed me that some of our most beloved TPPs are just a few guys (or one guy) trying to flesh out our hobby and honoring their sales and commitments the best they can between work, family, friends,et al. Considering my previous interactions with AH/MMP, I naively (?) assumed all of the TPPs were similarly structured businesses. They're just fans and players like you and me, doing their best to add to our fun, so I quickly learned to cut them some slack.
The guy just didn't have to be such a d**k about it.
Hopefully your order is resolved soon!