Volkswagen is standing by its accusation that Suzuki breached a partnership agreement by buying engines from Fiat.
VW said the Japanese company's complaints that its honour has been breached were "theatrical".
VW repeated that Suzuki has to "correct" an alleged contract violation stemming from its purchase of diesel engines from Fiat.
VW was responding to Suzuki's demand that VW retract its accusation of a contractual violation.
Suzuki chairman Osamu Suzuki said his company did not breach the partnership agreement. The allegation had "significantly disparaged Suzuki's honour", he said.