Are you happy with the car?
Looking on auto trader the going rate for a 2018 granturismo of any sort (Sport or MC) is between 55-65k, depending on mileage etc.. So yours is bang in the middle.
They are all advertised wrong as well, as all the MC's say MC-Shift, when they're actually Auto.
You can hand any car back within 28days of purchase regardless.
After that it's a little more involved and you and the dealer have to agree, and deductions get made etc.. Etc.
I would say, depending on spec, mileage and condition 60k seems about right, and an MC is still a cracking car!
So you have to decide if you're only interested in a granturismo if it's a 'Stradale' in which case, you need to do much more research as you obviously aren't sure on what you've been looking at.
It'll have to be an older car, it'll have an F1 (MC-Shift) gearbox and carbon ceramic brakes.
Are those things 'must haves' for you?
If not, just enjoy what you've got.