I paid for Creative Cloud for Students, but I can't open the apps. They prompt me to buy it (again)

I was using Adobe Creative Cloud using their free at-home access until it expired, so I purchased Adobe Creative Cloud for Students to continue my course under lockdown. 

I bought Creative Cloud and received a confirmation email on July 23 (subject: "Thanks for your purchase") which contained a link to confirm my account and create a password. I did both and received another email on July 24 (subject: "Welcome to your Creative Cloud membership").

I had already installed Illustrator, Acrobat DC, Photoshop, Lightroom and Lightroom Classic during the period of free at-home access, and after I purchased Creative Cloud for Students on July 23, I had access to those apps until about a week later (I don't know the exact date), when access suddenly stopped. When I attempted to access the apps, I instead received a prompt to buy the app or start a 7 day free trial.

I checked my bank statement, and it records a payment of $21.99 to Adobe Systems Pty Ltd Sydney AU AUS on July 28, with the value date of July 23.

Thinking that I may just need to download the apps again, I opened the email "Welcome to your Creative Cloud membership" from July 24 and clicked the link to download Illustrator. This installed the app, but when I opened it, a window stated that I had merely started a 7-day free trial. Creative Cloud Desktop confirms that I have started a 7-day free trial for Illustrator and I do not have access to the other apps unless I buy them or start free trials with them. 

I have already paid for Creative Cloud for Students. How do I get access to the apps? Since Adobe is already taking payments from my bank account for the purchase, I do not want to buy it again because I'll pay double. Please help me, as I need at home access to complete my course.