After reading Pugalongs reply about calling the passport office, as you know I tried calling them again. I also was able to receive the tracking from TNT shortly (I checked probably 3 hours after that call?)
Currently scheduled to arrive on Monday (will update when I receive the passport)
I never got an update from TNT themselves through email. But I just kept checking tracking on the TNT tracking page with my postcode and passport application number as the reference.
Hope that helps! Hopefully will update by tomorrow night with a passport in hand haha