Dollar Tree

I have been shopping dollar tree for many years and go everyday. I began shopping at the one on South Main Street in Downtown Wilkes-Barre, PA. I do like to use coupons on some items if I have them. I know your store policy on coupons and have always followed it. The manager began to get nasty to me and told me I can only use one coupon per day! I know it says I am allowed to use four of the same coupon per day. I am now only allowed to use one single coupon per day. Not only that but she yells and treats me like a dog. She is RUDE! She is nasty to customers and employees.