Are you actually applying for a specific vacancy at RasGas?

Companies don't just hire good people because they are good. They hire them to do a job, and if there is no need for someone to do a specific job, they will never hire you, no matter how good you are.

Don't waste all that money flying to Qatar and then not visit other employers, that would be foolish.

Clearly RasGas has no interest, so stop wasting time and look elsewhere.