Myself and my partner went for lunch after spendin...

Myself and my partner went for lunch after spending the weekend in the Docklands on the 15th June.
We had an Entertainment Card, and ordered drinks and food from the bar menu due to there being very few peolpe in the restaurant section.
Spent over $100 in total and went to redeem the voucher, but was told it was only for the restaurant, which it didn't say on the voucher. Why is that when the food and drinks are prepared by the same staff ?