Most companies are in the business of making money by selling/making something. Along comes the internet, and it fashionable to have a web site. It is a way for customers to find them, and get a quick overview of what the company offers.. But what does a widget maker/seller know about web sites? So they hire firms to create and run their sites. The emails may, or may not be forwarded to the company.
Emails are easy to send, and easier to ignore,. There's usually a phone number on the site., a phone call gets their attention.