Turned away for wine

I went to Picknpay Qualisave and Dobsonville it was 15.20 I stood in a very long line to pay for a box of wine. When I got to the till it was 15.35 and I was told that they don't sell alcohol after 15.30 why was the alcohol at that store at that particular time if they don't sell it on top of that their isn't a sign that says that in the store. If they didn't they sell the wine at that time why didn't they close the wine isle for us not to go there. I was turned away at the till them not even thinking of how long I had waited there and they didn't care. I was so emabarssed as I don't know that wine isn't sold agyet 15.30 they should've considered how long I waited their for it. This was very bad service I just wish they could do better