Kroger — pharma city

I just got back from krogers in new haven, In. to pay for my pills and they said I owed 35.00 for my blood pressure pills. I had my Good rx coupons with me and they said I could not use them because they expired. I did not know that they ever expired. Why don't they let me know. Now I am out $30.56 on my amlodipine 90 tablets and $15.32 on metoprolol pills. I am thinking about changing to another drug store.