Warranty and software issues on used iPhone 16e with replaced screen

I purchased a used iphone 16e from facebook market. i thought it was a good deal until i got home and found out that the seller never told me the screen was replaced? In this case, does that void my warranty all together? Now that I've had the device for two weeks, I am finding out more and more issues with the phone. The seller did end up returning some money back and told me to keep the phone (which now cost me 100) I've done my own work on the phone (only updating it on itunes and restoring it and such). Do you think they'll be able to hlep me out with this device, cuz it seems like it's got some software issues, and I believe it's really nothing I or the seller can do to the device to make it malfunction (according to analytics panic full log)?