Mr price sport embarrassed customer in checkers store

I went to exchange t shirts my daughter bought .when I enter the shop the manager want to know how dit my daughter pay her email adres ect. I call her to speak to him I did eventually change the shirts and pay the difference . I went to checkers to buy a few item asoon as I enter the store the manager and cashier stop me and ask we're my slip they want it for some reason. O they didn't had my email adres. I refuse to give it to them. The customers were looking and looking they made it look if I stole something I was so embarrassed . The cashier follow me everywhere she want the receipt. I chase her away what she did she standing on the end of the Ile and look we're I am and the customers looking at us. I went to her and told her this is arasment and if she don't go I call the cops and open a case I have the slips time and date. My question is what are Mr price sport going to do regarding their employees behavior. And about the embarrassedment I had to deal with?