I have the same issue, and I have dealt with the QB Support team, that thinks we are kids and asks us to connect to a bank using their canned steps. It's good you escalated it to Tier 3. Do not hold your breath. I had a payroll Webforce issue that QB did not fix for a year! I called so many times and wasted countless hours.

Hoping this will get resolved. I will set up webconnect by downloading them manually till this issue is resolved.