pharmacy services

Please fire me. I work at a retail pharmacy and there are these two customers who come in every week to steal from us. One day I noticed them come in and started to follow them closer than usual because I was tired of getting yelled at by my manager when they successfully steal things. At one point they split up near the make up so I chose to look after the girl with the big bag, thinking she could easily stuff more things into it. When they went up to the cash register they complained to my manager that they were never coming back because they were treated like criminals. Turns out they successfully managed to steal a bottle of foundation from the make up department while I was watching the other girl. Then they were back the next week.