Apple iPhone 11 Pro (Your Choice)

I bought this phone for nearly $700 and it was listed as "new", however it came in an after market box, with an after market charger that didn't even work. However, the real concerning problem is the minor issues I've had with the phone itself since getting it. Apps constantly crash, or completely won't even open (example shown in attachment, and unfortunately they will only let me post one video per review I have tons of examples of everything happening). The screen constantly glitches, sometimes with even a purple-ish pixelated color. Today the phone completely spazzed out and logged me out of every thing, including my Apple ID and deleted all of my messages, and will now not let me receive or make FaceTime calls. I've contacted Apple Suport and they just suggested I do a software update, but the phone will not let me download the update and neither space nor wifi is the issue. I also contacted the seller, but after reading the reviews and people saying the seller never got back with them I felt I should write a review as well, and I'm usually one to never do this. If you're thinking about buying a phone or anything else from this seller, I highly recommend that you DON'T. I was naive and assumed the issues would just eventually resolve itself, I also didn't want to admit I may've wasted nearly $700 on a dud, but they are gradually getting worse and worse, and I'll probably just have to suck it up and get a new phone or hope that GeekSquad or something can help resolve the issue.