You made a mistake of trying to catch the bird in the bush, while letting the bird in hand fly away. So now you are empty handed.
If they are taking more time, then surely you are not their first choice to join that role, they are only keeping their options open, if the first choice does not join.
So suggest, move one. Give interviews and join a descent organisation. The brand is not everything, the peace of mind and other things are equally important. So put the incident behind and move on...
From India, Mumbai