Saba To Go in Dublin

We got takeaway from Saba to Go and, as usual, the food was very good. One of us celiac and I called up the restaurant after having ordered just to check that they could keep the food for the celiac person separate from any gluten. We hard ordered the brownie, which does not have gluten as one of its allegergies listed on the menu. However, on the phone I was told that the brownie has gluten in it. I asked if it could be removed from the order, and was told this was an issue for the delivery app. This is not really acceptable as the mistake was on the part of Saba - advertising something as gluten free when it was not in fact. Furthermore, if I hadn't called up, my girlfriend might have been quite sick from eating the brownie.