The TV personality quit the show after her son Jack Osbourne got dropped from the network's new programme Stars Earn Stripes, which she claimed was because of his multiple sclerosis diagnosis - something the network has denied.
When asked if she had spoken to boss Bob Greenblatt, Sharon told The Hollywood Reporter: "No. I asked to see him, but he wouldn't see me. I asked to see him a good four to five weeks ago; sent him an e-mail. But he wouldn't see me."
She added that instead of contacting her he sent an odd message to her agent.
"I went on the David Letterman show, and then he sent an e-mail to my agent saying he didn't like it when I said the word Titanic," she continued. "I didn't know that he had anything to do with the Titanic. Why should he care if I used or say the word Titanic? I don't think he's well, bless him."
Sharon added that she has no intention of joining a rival TV talent show and is still good friends with the rest of the people she worked with.
"I've done it for nine years, and that's long enough; been there, done that," she insisted.
"The producers are amazing people - FremantleMedia and Syco Television, they're all amazing. I talk to them; they're my friends. I've worked with them for so long.
"One of the producers on the show I worked with for nine years because I worked with her in England and then came here with her, so I have a great relationship with them. The only problem is NBC."