Buy your own VoIP server and phones. Pay a pro to set it up.
Then pay $30/month for each access line to your local phone company. Figure about 7 people per access line (but two minimum), then adjust the mix as you get data from the phone company.
Your local phone company MAY even have their own VoIP gateway and all you’ll need is to buy their internet service.
I don’t have phone service through the usual kind of provider. I have an Ooma system, and that’s the only reason I can think this is happening. If I were with one of the bigger, well-known companies, this probably wouldn’t happen.