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In all likelihood there is no charity and you have been robbed off your money by a scammer.
After some time, "William" has to travel to Nigeria or Ghana for some reason e.g.
You will then be requested to send a large amount of money for treatment and promises that you will be paid back ASAP.
It's a scam, don't send a cent, cease contact and report the scammer.
Whatever creative, captivating and greed inducing story you read know this: it's a scam.
However much you send, you will never see the money again.