Dollar General complaint: Nasty manager, did not take my app coupons. Refused to fix it

I had coupons that expired today. There was also a 1 day sale going on and part of that sale was Christmas candles buy 1 get 1 free. Well she argued with me until I walked back and got the sign, then she was even more aggravated. She scanned the candles so many times I dont know if they are even correctly priced .
I asked her multiple times to make sure my coupons came off, I had to put my phone number in numerous times because she kept clearing the screen. So she totaled it and I asked if the coupons came off she didn’t answer and threw my receipt in the bag. At this time they were getting ready to close so she pushed me out the door and locked. I got into my car and was looking at the receipt and not 1 of my coupons were taken off. So I called the store, she answered. I explained about the coupons. Her response was – oh, well I don’t know what to tell you. Only certain dg stores take coupons. I said thats bs because I had that store marked as my store and every item I scanned came up with the coupon. She refused to open the door and refund my money, she said its not her problem come back tomorrow and talk to someone else. I told her I dont live around here, she said she didn’t care, so I hung up the phone. I shop at the dg all the time and never had an experience like this before,im very disappointed and I want my money refunded and I will not shop at dg any longer