I completely agree with what @wahajazhar said.
My Sportage also got invoiced on 8th Jan and fortunately, I didn't have to pay the new FED price, but if your Sportage got invoiced on or after 16th Jan, then you have to pay the extra amount, unfortunately.
I hope that your vehicle got invoiced earlier than 16th Jan, but to be honest, the signs are not good because if your vehicle got invoiced before 16th Jan, then you must have got your vehicle by now.