from www.tmz.com Randy and Evi Quaid know how to drive a hard bargain … because we’ve learned they still haven’t paid the bill for which they’re being prosecuted.

Sources connected with the case tell TMZ the $5,546.96 the Quaids sent the San Ysidro Ranch to settle the bill they skipped out on isn’t the full payment — not by a long shot.

We’re told the Quaids still owe another $5,000. And get this — we’re told Evi called the Ranch and said she and Randy would only pay the balance if they call off the dogs — i.e., they wouldn’t press charges.

Earlier: Evi Quaid thinks the cop who arrested her and husband Randy is corrupt. How do we know this? Because she just showed up at his office and went “psychotic” on him.

Deputy James Davis of Presidio County Sheriff’s Office in Marfa, Texas tells TMZ Evi showed up at the station just moments ago screaming at him, accusing him of being “a crooked, corrupt cop” who concocted “a plot against her and her husband.”

Davis described it as a “psychotic episode.”

He claims she followed him into the station and threw a handwritten statement at him accusing him of setting them up.

Davis says Quaid then went to a nearby courthouse and as she was leaving, backed into a motorcycle that was parallel parked.

A police report was taken. No word if any charges will be filed.