But without reading the law in question, and I would have no idea where to start because it's not US law, what does that actually mean? Prior request for what? A prior request for anything? If I buy a Lamborghini Hat and then I am delivered a Lamborghini Aventador, does that count? I certainly haven't requested a car. Likewise, these people haven't requested a PS Vita.
You _could_ assume it was a mistake, and give them an opportunity to take the car back, at their own expense. Personally, I would drive the car back in person to their headquarters
If you tried to keep the car claiming it was unsolicited, we would have to look at what happens in court. Assuming that you are the only one in the world getting a car instead of a hat, I think any judge would decide that the company is not sending out unsolicited cars to people.