Crocs — misleading offer advertisement

Address:

Mumbai City, Maharashtra

I visited the seawoods mall store of crocs. An offer on sandals, 20% off was displayed and 4 styles were shown in the offer poster.
I have purchased a style shown in the poster yet was not given the offer saying it is only on select styles.

This is a clear case of misleading advertisement and fooling customer into believing they have bought the offer product with discount. I raised this to crocs customer care but after continuous follow up they have just replied that select styles is written on the poster.
Crocs is showcasing the best designs in the advertisement but misleading customers in the process.
Kindly look into the matter.