As @olpk say’s there is a massive difference between the GT line and the GT line s.
You can still order the GT Line S on their website in mild,full,plug in Hybrid models, so the model has not been discontinued. Albeit its no longer available to order on the scheme, you should have still recieve the “S” model, as it was available when you ordered it!
From memory the GT Line sits below the Sportage 3 but, is basilly a sporty version of the Sportage 3. It was available at a much lower AP than the GT Line S, which is the top spec model.
The majority of manufacturers haven’t issued a spare wheel or space saver for some years now.
Sorry to say but, it looks like the dealership/salesman has pulled a fast one and given you a lower model than you ordered. Shame you didn’t realise before entering your pin as, you could have told him where to shove it. If it were me I’d still kick up a stink about it!