manager does not know their instore processes

i went to McDonalds this morning at 7am and spoke to the so called Manager noluvuyo, i asked her if i can place a bulk order for 31 Big Mac meals for my team lunch at work and she advised it will not be a problem, she printed a slip with her name and contact number and took my name as well and advised that she will give the order to the manager that starts after her. she advised that i can collect and pay for the order at 10:30. I got to the store abd spoke to Bridgette the so called manager on duty who advised that she was not aware of this and they are not allowed to take a bulk order as they work on a voucher system. I have wasted my time for what? to walk out there empty handed and dissapointed, i had to drive to the store twice in one day wasted my time and petrol for nothing. I support McDs all the time and this is the poor service I receive? Managers not knowing how to do their jobs. I refuse to support McDs in future, I am left with 31 angry staff members who expected their meals as guaranteed by the manager this morning and i ended up looking like a fool and i refuse to be embaressed becuase of the poor service, how are you going to correct this? i want a call back asap