If "addle" is meant to convey the idea of something scrambled, mixed up, or confused, then "badla" as revenge, would mean "revenge for the confusion/mess". This could be expressed as:
* Revenge for the mess/chaos.
* Retribution for the confusion.
* Reckoning for the jumble/disorder.
If "addle" is used differently (a specific slang meaning perhaps) please provide more context. The most appropriate translation hinges entirely on how "addle" is intended in this phrase.