The support is overworked and has a huge backlog. They recently hired new staff, so hopefully they will be able to respond faster soon.
Anyhow, I would try to disassemble the screen and clean the contacts, as this helped some users with display problems. If the issue with the display remains, you may have a hardware problem and need to replace it.
This is a different issue. With the latest software version you can recalibrate the proximity sensor, so it should work again. see first post for more infos: