I bought a laptop from otto. Now that doesn't work, I want to use the guarantee. What should I do?
Send him back.
Call Otto
I want to use the guarantee
Yes, then do it! Send the part back to Otto with reasons.
The best thing to do is to contact Otto first and report that the laptop is not working. You will then be told what to do.
Warranty, guarantee or have you bought an additional guarantee extension?
https://www.otto.de/.../garantie/
When it comes to the manufacturer's guarantee, this can also be handled directly by the manufacturer.