Tamara Mellon - Style
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Jimmy Choo co-founder Tamara Mellon filed a lawsuit against her former employer on Thursday, the same day the famed shoe house celebrated its 20th anniversary.

In her $4 million Manhattan civil suit, the British fashion designer claims Jimmy Choo “set out to punish her by effectively helping themselves to an indefinite ‘extension’ of the one year non-compete provision,” according to court documents obtained by PEOPLE.

Mellon, 49, states she followed through with her one-year noncompete agreement with Jimmy Choo before launching her own brand in 2013. Her namesake luxury label filed for bankruptcy in December 2015, costing millions of her personal investment and compensation, and forcing her to seek voluntary Chapter 11 bankruptcy protection.

Also in the lawsuit, Mellon claims Jimmy Choo “threatened Italian factory producers with the loss of business if they worked with Tamara Mellon or anyone affiliated with her,” adding that manufacturers “opted to refuse to do business with Ms. Mellon’s start-up.”

A Jimmy Choo rep tells PEOPLE: “This case is without merit and will be vigorously contested.”