A case that Quinn Emanuel Urquhart & Sullivan hailed last year as a “stunning” victory is ending in a dispute over legal fees between the firm and its onetime client, former oil executive Joseph Sigelman.

In a demand for arbitration filed last month, Quinn Emanuel said Sigelman still owes $3.69 million in unpaid legal fees for the firm’s successful efforts to keep him out of prison over foreign bribery charges.

But in a countersuit brought in Florida state court in Miami on March 7, Sigelman claims that he already paid the firm $8.4 million, and that he never received “complete invoices or backup for the astronomical amount of expenses” he’s accused of not paying.