I created a new databricks Trial account last night, I only got $4.00 in credit. Not sure why that happened.
I uploaded a very small dataset, 3 files (total 9KB) to the "Serverless Starter Warehouse". Did three queries to check the data and three hours later I was informed my trial credits were consumed and that my trial period was over.
So this morning I added my credit card information, upgraded the account to a premium account. I am unable to add/delete/edit any compute resources. I keep getting a notice that I am unable to do any of this while in a "trial" period.

I have verified that my account is now a paid premium account in account settings. I have deleted the original workspace and created a new one. All to no avail. So my instance is essentially worthless to me this morning.

Dave