Bigbasket.com — Rotten French fries - 6 month older product

I have received 6 month older French fries and kept in freezer, after 8 - 9 days we have tried to fry them but found it got rotten after open the pocket, then only I have seen the date it was more than 6 months older, I don't know how they are selling such products, what if it affects as a food poison. I need a proper response and corrective action of their operation not to happen again to me or any other customer. How dare they are playing with health and irresponsible answers from customer care.