"The largest security company in the world, providing a contract to their biggest UK client, turned years of carefully-laid preparations into an 11th-hour fiasco, " Labour MP Mr Vaz said.

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However, Benitez's agent Manuel Garcia Quilon said on Thursday that his client intends to see out the rest of his contract, provided the club's financial situation allows it.

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"The largest security company in the world, providing a contract to their biggest U.K. client, turned years of carefully laid preparations into an 11th-hour fiasco, " Mr. Vaz said.

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Another client was told that the reason he had been given the contract was because of the way he had treated the wait staff in the restaurant when he was taken out to dinner.

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Frischling said the agents threatened to call a client -- an airline -- and have them sever his contract, saying he was a security threat.

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Ms. Kessler flew to Los Angeles this month and told producers how a star would find someone like herself (likely through an agent or record company) and what the client should do (stage a charity event, sign a new makeup contract, come out with a new album, or anything to change the message).

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Even when the client and vendor agree to a fixed fee, the vendor can charge for work not outlined in the original contract.

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