It is an all-too-common and frustrating problem. Help the store get back on track, and be consistent and knowledgeable by meeting with the head manager.
Go over the policy and—politely—inquire about the training of employees. Store employees may be unaware of parts of their policy. Most managers are willing to learn and abide by the written policies after such a discussion.
Print out a copy of the store's coupon policy and bring it along every time you shop at the store. Let the printed policy do the talking in case of snags.
Issues not directly addressed in the policy will be decided by regional offices or the manager at each store location. If things aren’t working out after talking to corporate offices, store managers, and cashiers, try shopping a different location.
Here’s how to request your own copy of the store’s policy.