Created and Edited 9 New Projects now data Corrupted/missing

I imported media from an SD card and checked Synced with Cloud. All work done on iMac Desktop. Did simple edits on each of 9 projects (low quality 8mm film transfers) and exported each to YouTube. When I went back to them following day media files missing and as I selected a different project keyframe changed and data duplicated from another project.

Spent long time online chat/screen share with Adobe who saw the problem and took screen gabs etc. Promised call back next working day after rteferring to Rush Dev Team, then delayed 24 hours and now nothing from them for a nearly a week. No reply to my polite chase.

I have had to stop my archive digitisng project and worried I may have lost 10 days of work. Any ides how I can push Adobe for resolution?