The former drummer has been embroiled in a long-running war of words with the frontman ever since he refused to be part of the group's reunion tour in 2012, due to contract issues, and he hasn't been involved in the band's farewell tour, dubbed The End.

Bassist Geezer Butler hinted Ward had been offered the chance to play at the final Black Sabbath show in Birmingham, England next year (17), but Ward denied his comments, and Ozzy Osbourne furthered speculation he tried to get Ward to return for their final two shows during a recent Rolling Stone interview.

"I'm sad that Bill never came through," Osbourne said. "Every time I reach out to Bill I get yelled at for something. If something can be worked out, great."

Bill has now issued a lengthy response on his Facebook page, insisting Ozzy hasn't reached out to him since 2012, adding the frontman should pay attention to the reasons why he didn't "come through", claiming the contract was impossible to sign as it "devalued" him, and Sabbath representatives told him last year (15) there was no chance of him returning.

"I love all our Sabbath fans throughout the world, and to toss around ideas that I might play the Birmingham shows is both emotionally heartbreaking for me and spiteful," he writes. "I think the Sabbath fans who have loved the original band have gone through enough in terms of disappointment and sadness."

He's heartbroken not to be playing the Birmingham shows, but he feels it would be unfair on fans elsewhere if he only showed up for the band's hometown finale.

"This is not what I would have wanted or what I have chosen," he concludes. "My absence at the current shows and the future Birmingham shows reflects an undeniable and unseen misadventure that my accusers won't bear."