Dollar Tree

So, I went in to buy my coupon stuff and the coupons at the Dollar Tree and none of the coupons would ring up, but the number was the same on the products, but anyways that manager would not let me have these products and she said if it don't ring you will not be able to use them... While she was doing that she was running her mouth and gesturing way inappropriate to me, but I did forget to tell you that the cashier called for help to see if she could get the coupons to work... She went in the office and stayed in the office till she got called out for help again and finally she showed up... I didn't do anything wrong for her to act the way she did upfront at the register where everyone can hear... I know they can be pushed, because I seen them do it, but anyways they was the right products just a rude ask as worker who don't need her job