EARLIER: Designer Claims 'Oldboy' Poster Designs Were Stolen by Ad Agency

Lee responded to the letter on Twitter Thursday, tweeting "I Never Heard Of This Guy Juan Luis Garcia,If He Has A Beef It's Not With Me.I Did Not Hire Him,Do Not Know Him.Cheap Trick Writing To Me.YO."

Several people commented on Lee's Instagram page, asking the director to help Garcia. When one man wrote "Dude pay the graphic artist," Lee responded:

"Why Should I Pay Someone Who I Never Met Nor Had Any Contact With Ever? He Never Made Any Deal With Me.Why Don't You Pay Me For Your Stupid Text On Thanksgiving Day?"

Earlier, in his open letter, Garcia said he wanted to contact Lee after seeing the director had used the Oldboy promotional materials in question in his social media feeds.

"I couldn’t believe that you had been using and claiming copyright on three of those very same posters I designed," Garcia wrote. "I just couldn’t believe it. I perceive you as an advocate of the arts and artists and have a sinking feeling that you are as much of a victim in this as I am."

STORY: 'Oldboy' Stars Talk Differences Between Two Versions of Film

In an email to The Hollywood Reporter Wednesday, Garcia said he hoped Lee could help him resolve the situation with the ad agency without taking any legal action. He said he wasn't naming the ad agency because Lee knew "exactly who" he was talking about.

"I don't want to sue anyone, it's not in my nature, but if that's what it comes down to, so be it," he wrote in the email. "I'm thrilled he liked the posters and hope they continue using them, but I need to be renumerated."

Oldboy is bombing at the box office, and may not reach $2 million during its five-day holiday debut. The film stars Josh Brolin, Elizabeth Olsen and Sharlto Copley.

Graeme McMillan contributed to this story.