Sorry, but it sounds like you wanted something for free (making some assumptions about subsequently being able to change to a different plan) and are now frustrated it didn’t work out exactly as you’d intended.

Too late for this time, but a personal practice I’ve adopted is to make sure I’m paying for the thing I want before building on it (even if there’s a trial), so that the company views me as a customer. Ie tending to upgrade before it’s strictly required.