Red wine taste disgusting

I've been googling if wine can go bad, because the Robertson Smooth Dry Red i bought smell bad and taste different. I even tried mixing it with coke because it's a 3 liter box and it will hurt to just throw it out. I am really disappointed with Robertson Winery, I've been drinking their wine since my first year because it's the best but now i am wondering if the times changing have change their quality of the brand. I am really skeptical to buy it again considering i am still stuck with this bad wine