(The Local) The Giving Pledge, started by Microsoft founder Gates and US investor Warren Buffett to encourage the extremely wealthy to promise to give half their wealth to good causes, announced this week that software mogul Plattner, one of Germany’s richest men, had signed up.

But a disgruntled Plattner later said he had made no such commitment to give away half of his money.

“I feel Bill Gates has gone behind my back and used me,” Plattner told regional newspaper the Potsdamer Neueste Nachrichten on Thursday.

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