On April 1st 2023 I signed up for home fiber internet + a mobile phone plan. Because I signed up for both services the MagentaMobil S had 20 gig instead of 10. Unfortunately, after 1 month, it turned out that the fiber couldn't be installed in my flat because of technical reasons. As a result, my MagentaMobil S was downgraded back to 10 gig for 38+ EUR.

The in-store customer service rep told me that I can make a change after 3 months. I'm not satisfied with the value of this current deal so would it be possible to cancel after the first 3 months seeing that I signed up with the impression that I would have 20 gig at that price?

I don't speak German as yet and I already sent an email inquiry but got a response stating when my contract ends.