Illegal for stores to charge for branded plastic bags

I recently shopped at Anna Aluminium in Menaka, Kochi, and was charged ₹5 for a plastic carry bag. I didn’t notice it (the bill) until I reached home, but the bag had the store’s branding on it. (Yes, not checking the bill then and there is completely my fault :() From what I understand, businesses aren’t allowed to charge for plastic covers that display their branding since they serve as advertisements. Is there any way to report this without getting into legal trouble? https://preview.redd.it/gr2tn36jjmke1.jpg?width=2096&format=pjpg&auto=webp&s=b6f3950cf9333d20f9667d588cd7becb4545c768 https://preview.redd.it/pazse46jjmke1.jpg?width=2250&format=pjpg&auto=webp&s=cf944f5bef26a017ed7c5c19a06614387c0274b8