The article itself states
According to local newspaper Hankook Ilbo, Netflix is "in negotiations with the phone number owner to resolve the issue," though another outside party has stepped forward and offered to take the situation into their own hands.
South Korea's National Revolutionary Party's honorary chief, Huh Kyung-young, has reportedly offered to buy the phone number for 100 million won ($85,000 USD). "I heard that the owner of the phone number showed on a business card in Squid Game is suffering serious damage from prank calls," he said on Facebook. "I would like to buy the number for 100 million won."
Here's another article where multiple victims are mentioned (and multiple settlements).
Though, I wonder. This can't be the first Korean TV show that shows phone numbers on screen, can it?
The US has their 555 numbers. I recently learned that Germany has them (pdf), too. They even call them "drama numbers".
And, yes, South Korea has some as well. Since the show is produced in South Korean someone there did a pretty stupid thing without thinking.