troubles with redeem code

I have a CC Photography Plan (20GB) since 2014, with annual billing and automatic renewal on August 22nd. The next renewal is thus scheduled for August 22nd, 2023.
On Monday (November 21st) I bought an additional 12 months of CC Photography Plan (20GB) via a black friday offer. However, after redeeming the code nothing changed. According to Adobe policy, my renewal date should have been postponed by 12 months (thus August 22nd, 2024) after the purchase.
Other photographers who bought the same this week got the expected behaviour (i.e., a shift of 12 months).

I opened a ticket with Adobe and Adobe char support four times so far, and we are running in circles. I describe my issue (every single time...what's the purpose of having a ticket system then?), I get told that the code was not redeemed, I redeem it again (even on a browser with clear cache, etc), it is treated as a new account (even though I am logged in with an existing one) and a few minutes later, when I check my account details and renewal date, it is as if I did nothing.

The last one on chat suggested to cancel my subscription, wait a few days, and then redeem the code.

I would have hoped that a company like Adobe was able to promptly solve issues like this, without canceling and redoing subscriptions...

Any ideas?