Venezuela has not told U.N. it is changing representative -official

NEW YORK, Nov 29 (Reuters) - Venezuela's government has not officially notified the United Nations of any changes to its representation at the organization, a U.N. spokesman said on Wednesday.

Four sources told Reuters on Wednesday that Rafael Ramirez, a former oil czar turned U.N. diplomat, had been sacked from his post amid a broad oil industry anti-corruption campaign. (Reporting by Michelle Nichols in New York, writing by Brian Ellsworth)