Unfortunately, there's nothing you can do since Bitcoin transactions are irreversible. You just have to learn from the mistake and move on.
Thank God people are starting to understand how flawed BTC is.
We are recommend everyone to take a closer look at our coin
I think it will be useful for everyone to read this article:
Reversing Illicit Transactions on Bitcoin Is SimpleP.S: BTC - is BTC. Real Bitcoin - is Bitcoin Satoshi Vision