Hortenzie,
When you make a voluntary donation, without stipulating what the money is to be used for, the people receiving the money can do with it as they wish.
Nobody held a gun to your head and forced you to make a donation to the WTS. Yes, you were manipulated by them, and believed you were donating to a good cause, but any lawyer worth their salt will tell you that it is your responsibility to do due diligence before handing your money over to people you don't really know. There are scam artists everywhere and no matter what they promise you, it is your money until you decide to part with it. Even stores are not required to refund your money when you make a purchase - they will make an exchange or credit or refund as part of good customer relations, but they are not required to refund your money once you have taken delivery of their product.