DISCHEM PHARMACY SOLD ME EXPIRED MEDICATION !!!!!!

I bought medication from Dischem in Clearwater mall. I was about to administer the 5th dose to my granddaughter who is one month old when I realized some of the sachets were expired . It expired in August 2023. Upon taking it back , the pharmacy manager just brushed me off by telling me " argh ,it's fine ,nothing will happen . You can still use it 6 months after the expiry date " DOES THAT MAKE IT RIGHT ????? WHY ARE THERE EXPIRY DATES ON PRODUCTS THEN ???? Can anybody tell me where I can report this to please ?