Poor Quality of Ferrero Roucher

I purchased 3 packs of Ferreros from Checkers Hyper Gateway a week ago.

Once i opened the 1 pack the chocolates seem to be tasting different and the product seems to be stale as it doesn't have the taste that normally comes with,

Could someone please assist me in exchanging these items so i can enjoy the exceptional taste of Ferrero and I can enjoy the goods which i purchased. Note: 2 packs are still sealed and 1 has been open with expiry dates months from now