I feel your pain. Some of the larger companies here have issues and is the main reason why I will not be a fat cat company. The customers I have are 20+ year repeat customers and part of the family.
We strictly do commercial HVAC/R only with commercial kitchen as well as many county administration offices including around 80 buildings for Cobb County, but we do no data centers or cooling towers. We are nuts to the wall at the Airport installations right now.
Send an email to me. Find the Contact Us link at the bottom of each page. Let me know who you have been using. I've been here for more than 30 years and may be able to help you find the company you seek. No guarantee's though but will try.