WHACK THE MAC

I AM SO OUTRAGED WITH MC DONALD'S MILNERTON AND WHACK THE MAC!!! i had a 90c offer that was not expired, i left my work place and drove to mc donalds which is three minutes away, when i got there my 90c Mc Chicken was gone. THE WHACK THE MAC IS A ****. I called the call centre as the manager of MC Donalds milnerton made it out that i just wanted a free burger! when i drove there specifically for my deal. Then the call centre tells me the offer can change before it even expires!!! so one minute you at work and get your offer, 3 minutes later you at Mc Donalds to redeem the offer and its not valid or changes!!! **** **** ****