Family Dollar complaint: USE OF APP COUPONS

This is the SECOND time I have been denied use of the coupons that are clipped on the Family Dollar App!!! The first time about 2 weeks ago I was denied the use of a coupon for Tide Laundry Detergent and today 72422 I was denied the use of the coupon for the 4 Boxes of cereal! The 2 people in the store kept telling my son and I that we had to get all one brand and then they told us that the cereal didn’t qualify!! Your coupon CLEARLY states that any combination as long as they are the brand of cereal listed on the coupon!! I am angry because first of all it’s embarrassing as a customer and 2nd that I had to literally go drive to another location just to buy 4 boxes of cereal and the coupon was used with absolutely no problem or questions!! This store on Navigation has been my go to store for the last 10 years but because of this treatment, I won’t be going back!!!! THEY NEED TO BE PROPERLY TRAINED ON HOW TO ACTUALLY READ ABOUT THE PRODUCTS THAT THEY ARE SELLING!!!