Caterham F1 Team's buyer - Engavest SA - insists it has paid for the team's shares but not received them from Tony Fernandes.

After a team statement on Wednesday warned that Engavest was threatening to pull out, saying Fernandes was still the legal owner, Fernandes himself tweeted: "If you buy something you should pay for it. Quite simple."

However, Engavest has now released its own statement disputing Fernandes' claim that it hasn't paid, and again said he is "fully responsible" for the team.

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"On 29 June 2014 Engavest SA signed a Sale and Purchase Agreement with Tony Fernandes and the Caterham Group to acquire the shares of 1Malaysia Racing Team/Caterham F1," the statement read.

"Engavest SA has fulfilled all the conditions precedent, including paying the purchase price for the shares.

"The shares have not been transferred and therefore Mr Fernandes remains the owner of Caterham F1 and is fully responsible for all its activities."

Fernandes has informed that he will make his own statement on the situation later on Thursday.