Worst Service

I purchased a Groupon Voucher about a month ago and made a booking for the 21 Feb. We get to Adega yesterday (21 Feb) and i realized i forgot to bring the hard copy of the voucher. There were 2 managers on the floor who refused for us to eat there or come up with a solution. It was my fault for not having the voucher but we showed them the voucher on our cellphones and even said we will email the voucher to them right there but they did not have email access. The managers did not even say lets change the date of your booking or would you like to stay and eat of the menu. the guy manager stood there and said sorry i cant help you and we had to leave.I will never eat out there again , if your managers have no care towards their customers for me they should not be managers. Its sad and disappointing, i mean its just food that you could help us with, we would have paid and ate of the menu if you offered that to us.