They don't complain because it's your car.
I'm sensitive to tyre size which is why I asked.
You're making my point when you say the wheels are not original Volvo wheels, which means whoever had the car before you just put those wheels on with the tyres that were on there because it's cheaper but not always right.
There's no need to speak to Mason's about it. We are here telling you the correct tyre size so it's up to you to get the right size tyres if you would like an accurate trip meter. Otherwise get them when you wear out these ones.
If you want the original wheels they are 15". If you wish to keep the 16" aftermarket wheels, you need tyres of a lower profile to match the 15" total diameter (wheel + tyre)