Cashier made me go to customer service to redeem c...

Cashier made me go to customer service to redeem coupons I'd received in mail. What upsets me is that I gave them to her before she started ringing up up. Not even an I am sorry. That's customer service?
Swearing to never go back I went in Fri. asked produce lady where Olathe sweet corn was, her reply rude saying " No we don't have any"
City Market you no longer have my business, shame on you.