Pepsi 1 / 2 Litre Plastic Bottle — Expired Pepsi sold to me

Yesterday on 19th Nov. 2009,I purchased a Pepsi 1/2 Litre Plastic Bottle from shop near to Sec-23 Market,Faridabad,Haryana. At the time of purchase I did not check Manufacturing Date of that bottle.
But at home when I was going to drink to that pepsi I read that Manufacturing Date was 11.08.2009 and it should be consumed with in three months of manufactruing.So it's expiry date was 11.11.2009.
That means shopkeeper sold expired Pepsi to me,which could have caused major illness to me. I was saved as I read the Manufacturing Date at time.Otherwise it could have very serious effect on me and my family.

When I went to return that Pepsi to shopkeeper but he refused to take it back as it was opened.

Pls take action so that others are saved from drinking expired Pepsi.