It came after worker Halli Thorleifsson tweeted to Mr Musk saying: "Your head of HR is not able to confirm if I am employed or not". Mr Musk responded by asking: "What work have you been doing?"After a series of follow up questions and answers Mr Thorleifsson said he received an email confirming that he had been fired. "Mr Thorleifsson had previously told the BBC the situation was "strange" and "extremely stressful"