Wrong car delivered, questioned for further action – Nissan Micra

Hi, everybody, I’m sorry if I’m now posting in the wrong forum but as an absolute layman, I’m just baffled. My mother bought a Nissan Mitra Tekna a few weeks ago as a daily registration (price at about 16,000). It was also explicitly stated in the purchase contract that leather seats should be delivered, which was an important point for my mother. On the day of the transfer, the seller knew nothing about it, and so my mother had to bring the purchase contract again. (downright) seller is a manufacturer’s error, and the leather seats would probably be far too expensive for the price. As a reparation he proposed three variants: -Winter tyres worth 800 euros -comparable demonstration cars -or withdraw from the purchase contract Since I am not very experienced myself and my mother (also due to her age) is doing relatively hard with the decision, I wondered if anyone here in the forum might be able to solve this problem. only winter tires I find relatively little, but I can’t judge it… Thank you very much