How to cleanup (delete) a matrix-whatsapp install

[labor4]

Hi there

It seems I'm having trouble uninstalling a whatsapp bridge.

Namely:
All the rooms I had from the bridge remain forever as "archived".
It won't help to "forget" or "remove" the room.
They always return after re-login.

If I reload the page, they are gone.
If I re-login (which takes forever) they are present again.

It seems they are somewhat stuck in my db.

Thanks