Dollar General

My digital coupons are not coming off. I add them and there on my coupons. Get to the register put in my number takes off some and not others. I makesure it's the correct product look at exp date . It's just not coming off am really upset because I have probably lost a good 30 dollars on coupons. And buying more things . Stay on the phone for 45 min waiting to only find out to go online . Talk to 2 different departments back and forth . I go to dollar general because of the digital coupons . And also the manager can see you have it downloaded and said they can't do anything if they don't come off . I really would like to talk to someone and get answers this is a RIP off . False advertising.