Expired products

I had a running tummy for the whole weekend and was asking myself what can be the cause of that only to find out that I have been buying expired "danup " blend of multigrain with yoghurt, I only realize wen I bought one today from cosmo city the date reads 01\05\2019 and it's the 6th today....when I made the security guy aware of that since I left my slip with her they just told me to exchange it..... Is this how Cambridge does its business????!!