Employer has a handbook which the contents we agreed on district manager is changing it and we (cont.)?

didn't resign anything. What we sign when we start to work for this company means we agree to follow the employee handbook for attire, appearance every aspect of the company, including our benefits. I work for a major chain of restaurants in oregon and our employee handbook tells us that we have employee discounts on meals and free drinks (if we bring our own cups). Now that our store isn't making quite the rather extravagant numbers our district manager wants he's leveraging our employee discounts and free soda against us making those numbers, even telling the managers we are not allowed to "purchase" drinks while on shift(or break) including lunch break. Human resources who is supposed to handle these issues has tried but still no luck getting them back 100% of the time. What recourse do we the employees have?