Vitamins for Pregnant women

I bought some Vitamins for Pregnant women from Checkers at the Amajuba Mall in Newcastle on Friday 29/05/2015<br> <br> Yesterday I realize they have expired in 2014 already and just because I have used 3 tablets and don't have my slip anymore they refuse to refund or replace it, I did made it clear that they can take 3 from the new container or I will pay for the 3 that I used but they refuse.<br> <br> I now I were suppose to check the date but didn't think about it at that time. It's close to R100.00 that's now wasted