disappointment

Today i went to purchase contact lens eye drop at 7-11! I was depressed by the product that i just consumed! I forget to get the receipt from the cashier but there is still 2 more bottles left it over there! You can go to LAKESIDE MRT 7-11! The box is a bit dusty! I admit that i didn't checked properly because i was thinking the internal will not have faculty BUT i was wrong! I opened and enveloping with despair! Why the shops still sell!? Furthermore the contact lens eye drop cost me $6.10! I'm so foolish!
People , next time be more cautious and look out for faculty! Check before you purchase!