Last time I talked with dbt on their enterprise plan for the Okta integration level they pitched us 3000 user/year with the clear acknowledgement that they just raised their prices 100% on their other tier and were about to do major price increases to their enterprise tier.
Have the sales team fly in and kick them out, etc. Try to get the highest level people possible engaged, then get unreasonable. All of these folks will report some crazy deal opportunity and their chief sales guy will be at their throats back at home. You’ll get the concession you need. Best advice is to just avoid suppliers like this.