Unfortunately for your situation, this is a user-to-user forum, and the only people who can help with subscription changes are in Customer Service.
The word from Adobe is they can cancel your existing membership when you sign up for the new plan.
Sven, did you have a license for Photoshop prior to getting the single app subscription?
If not, I'll be interested to hear whether Adobe considers you eligible for the Photography Bundle.
Yesterday Adobe opened up the program for all customers as a special Black Friday deal... The offer is available only for a limited time as Curt pointed out, although the low price rate for the bundle doesn't have an expiration.
If you're a current subscriber and are asking to switch plans then check out this other related thread – it may help: