Notebook defective after repair, can it be replaced?

I have the following problem: I bought a notebook on February 19, 2020 from Saturn for 1200 euro. Unfortunately, I had to find out within one month that one of the USB ports was not working properly. In the beginning it worked sporadically until it completely went on strike and didn't work since then… So I turned to Saturn and spread my angry mood. I asked if it was possible to exchange the notebook because it had a defect within a month. This was of course rejected "the 14 day exchange period is over, otherwise we would have done it". Yesterday I was allowed to pick up my notebook again. When I was at home and tested this, I was amazed to find that the "Del" key is broken. I have already tried everything possible: reset Windows, uninstall driver etc. I connected an external keyboard and the key worked there. I've been waiting for my notebook for 1 month. Now it has a defect again. I don't see it paying a 1200 euro for a notebook that doesn't even work properly. It is obvious that I unfortunately got a Monday device. I also found that the repair workshop removed the previously installed SSD from Samsung and replaced it with a Skyhynix. Can they do that? It worked smoothly. I compared the values, the Skyhynix SSD is definitely slower than the Samsung SSD. I'm urgently dependent on this notebook because the universities are closed. I have to be able to attend online events somehow. The device is not even 6 months old. I'm simply afraid that a defect will appear again after the 6 months and then it suddenly means that the burden of proof lies with the customer. How can I do something like this?

Can I insist that I get a new one?

PS: The entire mainboard had to be replaced in order to replace the defective USB socket.

I ask for your help because I'm getting really desperate. For 1200 euro you can expect everything to work 100%.

The notebook at Saturn was longer than I could hold in my hands…

Contact consumer protection. If they can't help, contact the federal consumer arbitration board.

There's a legal warranty period of 24 months. A guarantee for a new device, so to speak, if the damage was there from the start.

Otherwise you have to look at your device:

https://www.mediamarkt.de/...ratur.html

You didn't get a neies. You got a used notebook that you thought was good.

At Apple, the standard is to serve customers.

Give yourself. You want a new device. The emphasis is on "NEW", not on exchange.

You have the power with the intrnet. You can cut a company down if it hugs you. So. Not so shy. It's easy to cause a streak here.

You will get an "echctes" new one.

Hi, it's not from Apple. It's from Lenovo, which in turn makes me a lot sadder because they actually did good things for years. But what I'm now experiencing with this notebook is more than underground…