Sour omlete checkers heidelberg running down

Im extremely disappointed at checkers heidelberg Bought an omelet that had mince filling Expiring date sell by 20/02/20 I don't know whether 1. The food was left out from previous days production 2. simply heated up as to not have increased waste . The egg was off and sour the mince itself was sour . How do you sell something thats expired to people at 9AM as breakfast. Production starts at 6AM meaning fresh food needs to ne produced or the aim of checkers is to make people sick