Yeah you would or should have. For the last year or so we have been updating the WHOIS on the move to the buyer. It has been longer than that on the Afternic side. Before that on the GoDaddy auction side there was a link in the sold section that allowed you to contact the buyer. To be frank though, what makes you think they will care even if you do contact them? If you sold it with us not only did we contact them when they bought it to urge them to change the WHOIS (under the older system, as I said the new flow updates the WHOIS by default), but we also send out mandated reminders to them about it at least once a year. Beyond that if you reported it to invalid whois and they see the info is bad they suspend the domain so the customer can't use it until they resolve the WHOIS issue. They also reach out, often times by phone as well in addition to the other times we reached out above. I'm not saying this in the tone of a smart a**, but as a guy who used to run a few departments here and knows that we had a hard enough time getting people to accept the domains they paid thousands for into their accounts let alone getting them to update the WHOIS. This is precisely why over time we moved to ways where could "force" the domain to the new owner and use the new WHOIS from their info. Beyond that it is not usually an easy task to get someone to change their info. The right step for you would be to report invalid whois and then let the department reach out. As I initially said, bottom line is you can't force someone to change the WHOIS short of a court order.