I agree to talk to the store manager. I am sure someone has more of a clue than the nighttime manager you spoke too. I also think your letter writing is a great idea. Kroger really needs to come up with a written and consistent coupon policy (varying by region would be okay just not store to store). Leaving everything up to manager discretion is frustrating for consumers and must also be hard on their staff who have to deal with us frustrated consumers. I doubt that corporate will do anything about this particular incident since it is within the mangers right to limit coupon use as strictly as he wants but maybe if they get word of enough people being upset and confused by these types of things they will get a written policy.

Good Luck!