When Vendors don't answer calls, emails, voicemails?

In my experience, I'm calling &/or emailing about technical information that the vendors do not have on their website. I realize it takes a day or two to get to that information & I don't have a problem with that. The problem we all have is NO return calls or emails, we live in an information age & a very few companies utilize it. They hire a skeleton staff & expect them to do the work of three to four people without compensation (i.e. overtime or a possible bonus for a jobs well done). All of us are inundated with telemarketers & charities calling or phones. When I get those calls, I either don't answer & let it go to voicemail, or answer, hang up & block the number. I retired just over two years ago & got a personal cell phone, I've received & blocked over 5,000 numbers on this phone in that time frame. Mom & Pop companies are limited, I know but sometimes you have to take the good with the bad & deal with it. The vendors the the OP & are are referring to, are probably major companies/ corporations who skeleton staff expect major results & goals. Rant over. LOL