One of these suits, filed earlier this year, invokes an arbitration clause in employees’ contracts that, according to Mashable, leaves Musk’s company on the hook for $1,600 in arbitration fees per two-party case, but only requires that former employees pay $400. With over 2,000 cases, the social media network’s arbitration bill alone comes in at nearly $4 million.

X has reportedly refused to pay those bills, either—arguing that it hasn’t required the former employees to move their disputes to arbitration. Now, ex-staffers have filed another lawsuit demanding the company pay the fees associated with their original filing.