Are you just referring to providers for hearing aid products - like a hearing clinic or dispensary? Cuz it seems that EVERY provider of ALL services wants a phone call or even better, I see a LOT of sites requiring us to fill in a “Contact Me” web form. Like keeping us at arm’s length.
You’re right about the stingy sharing of emails tho! Unless it’s a general “info@ABCompany.net” or some such, it’s VERY RARE for an audi or provider to share their business email with us customers. I’m guessing it’s cuz they want some kind of barrier between us and them. Phone calls and contact forms are routed through a gatekeeper.
I’m VERY lucky to have had both my previous and now present audi share their business email with me, so indeed, that’s how I’d make an app’t, share information or bring up an issue.