The defamation lawsuit filed against Pebe Sebert in a federal court in Tennessee on Wednesday alleges that the “Tik Tok” singer’s mother has “continued to publicly defame” him since the 2014 complaint.
“After we originally filed suit against Pebe Sebert, she continued to make outrageous, false and defamatory statements against Dr. Luke in her widespread media campaign to damage and smear his name,” Dr. Luke’s lawyer Christine Lepera said Friday in a statement to PEOPLE.
“Pebe Sebert’s lawyers flat out refused to allow us to add those statements to the existing case or to toll the statute of limitations on them – so we’ve been compelled to file an additional action,” Lepera said.
Kesha’s reps were not immediately available for comment.
The latest complaint alleges numerous offenses such as a November 2015 tweet reading, “Kesha can’t legally put out music unless she makes it under complete control of a man who raped her at 18.”
Though the “Your Love Is My Drug” singer has not released an album of her own since 2012’s Warrior, Kesha has been on tour with a new act called Kesha and the Creepies.
In August, PEOPLE confirmed the singer had recorded music “at her own expense.”
In 2014, Kesha sued Luke, accusing the producer of raping and sexually, physically, emotionally and verbally abusing her.
Luke vehemently denied the allegations, in suing the pop star for defamation and breach of contract.