Zoe
Ive always had it explained to me by the dealer, They let me inspect the car before anything is signed or pin entered, as they have to tick off a check list to say they have showed you everything and the car is suitable and then PIN number any outstanding payment etc.
None of that matters now and with such a big mistake you wouldn’t be expected to except the car anyway as it’s obviously not suitable.
Good choice on the Volvo have they given you an expected delivery date? I know when we looked last year the wait was about 9 months min.
definitely don’t enter your PIN number until you’ve checked out everything next time.