Hello flemmingL,
Unless you are using a VPN or proxy, your IP address is public knowledge. From that, they can sometimes identify your city. Since you have made contact with the site, there is a direct connection there. Until you quit Safari, they can send you chat requests, popups, etc. In theory, they could also use "super cookies" cross-reference your other activity on the internet. I only say "in theory" because it depends on if they have the money to pay Google or Facebook for that information. It definitely exists and will be delivered to anyone who can afford to pay. But considering this particular crew is still in the clipart category, they probably can't afford very big data. I wouldn't worry about it if I were you. If you do want to worry about it, maybe you should get those ducts cleaned first, or get a locked-in price on a new water heater, or perhaps a free cruise. There is no end to the scams these days.