I just paid for an upgrade of Adobe Rush but it's not upgraded.

 I have same experience and very-very frustrating.. it has been more than 24 hours already. I paid via Apple, and I still can't access full Rush capability. My money has been deducted as well. The Support was not helpful, and keep asking same question, and suggested me to contact Apple. When I contacted Apple, Apple asked me to contact Adobe 🙂

Funny thing is that, none of the support asked me for details like receipt, email or bank statement or screenshot. 

Too much effort spent for a plan which cost less than USD10...

Hi there!

Thank you for reaching out. I hope this helps: https://helpx.adobe.com/premiere-rush/kb/known-issues.html#Accountrelatedissues

Let us know how it goes.

Kartika