didnt accept entertainer voucher

On easter monday we went for breakfast and prior to ordering asked waiter janek if entertainer voucher will be accepted... he said yes. On payment he said manager would not accept. On speaking to manager he threw some public holiday story at us and ignored the fact that his waiter had already accepted voucher....then followed with bad attitude. I am a local and have been a regular there since greens opened ....owner should choose a manager that is not that dof to piss off regulars..... besides ...the waiter is effectively legally accepts voucher and manager should be smart enough to support that....we not talking big money her so why give customer uphill of note.