Industrialist Anil Ambani today called on Prime Minister Dr Manmohan Singh. The meeting comes within days of the Supreme Court rejecting his Group firm RNRL's plea for cheap gas from Reliance Industries as had been decided in a private family agreement of 2005.Mr Ambani did not take questions from media on the purpose of the visit.The apex court had on May 7 ruled that the Government is the owner of all gas until delivery to the consumers and had the right to fix its price and users.