There are 2 possibilities, either you want to send bitcoin or any altcoin to any address or you don't.
If you do then nothing can reverse the transaction, how ever if still not confirmed you may double spend it which I think you lose everything
Only the coins never reach the destination, I'm not sure how double spending works and if detected by block chain what happens to the coins
But when confirmation happens nothing can bring you back your money, sorry if you lost cash to scammers.
not yet, but is something that i want avoid.....
thanks
But really you cannot cancel the transaction you send because blockchain dont have the features like that. And thats what taking advantage for the fraudster because they knew bitcoin dont have cancel button and anonymous they make ways to scam people like making hyips,investment program and any other scam attemp existing there, not having cancel button for blockchain really not big problem and it helps people to be anonymous online but if you get victimize by scam or fraud well you will curse it because you lose your money.