So if I understand this correctly...

Some complete stranger on the internet asked you to send them some bitcoin for no reason.

Then they gave you a bitcoin address to send the bitcoins to.

Then you sent 10X more bitcoins than they asked for to the address they gave you.

Then they told you that they accidentally gave you a gambling address and that the bitcoins are gone and you can't have them back.

Is that what you are saying?

If so, you've been scammed.

Someone decided they wanted to gamble, but they figured they'd see if they could trick you into paying for the gambling for them.

It sounds like they succeeded.