Helmut Marko has denied reports that Sebastian Vettel was summoned to Red Bull's HQ to explain his behaviour at the recent Malaysian F1 GP.The Narain Karthikeyan-saga aside, reports suggested the German deliberately ignored his bosses' instruction that he retire his race car- ostensibly due to a brake issue - so that he could fit a new gearbox without penalty in China.The reports suggested Vettel had confessed immediately after the race that he heard the instruction but chose to ignore it.LONG-SCHEDULED MEETING"That is all nonsense," Red Bull's motor racing consultant Marko told Sport Bild. "Sebastian did nothing - absolutely nothing - that was against our wishes."Marko said Vettel's visit to Milton Keynes in Engand was scheduled long ago, adding that he would be working inside the driving simulator, among other things.He also hit back at claims that the 24-year-old could be penalised by the FIA for breaching the code of conduct when he showed "the middle finger" to Karthikeyan. "The matter was resolved during the meeting with the stewards (in Malaysia). For me, the case is closed."Speaking to Kolner Express newspaper, however, an FIA spokesman confirmed that the code of conduct forbade superlicence holders from insulting their rivals but added: "I imagine the application of this paragraph was considered by the stewards in Malaysia."And Sebastian Vettel's media people? "We know of no investigation."