This is my first time of hearing about this exchange...
Idk about you but it runs many years already and selective scamming its users too, it has a like service the changelly that has the same track record
They had already several scam accusations against them and I think they are not listed on Bestchange (I have not found them on BTC to usdt.
They are actually in there
[1], changenow admin and bestchange admin already replied the OP's complain there and the coins sent by OP is considered as high risk (gambling, stolen coins), as its against their TOS, it looks like changenow has the uppe rhand on this case.
About the refund request of OP i don't think it will be sent too soon.
[1]
https://www.bestchange.com/changenow-exchanger.html
