A group of Israeli real estate investors sued Wilson Sonsini Goodrich & Rosati on Thursday in an effort to stop an arbitration initiated by the firm over $480,000 in unpaid legal fees. The former clients claim Wilson Sonsini tricked them into signing an engagement letter with the firm and then blew past billing benchmarks.

The investors’ suit, filed in Manhattan Supreme Court by Rafael Barouch Elkaim and his co-plaintiffs, seeks to halt an arbitration that Wilson Sonsini initiated last month against them over unpaid fees.