so after refresh hi low changed automatically ..
if i refresh your site your site default setting is low..
but in that time. is automatically changed to high.
So want to ask for refund of what you have lost because you think that you have lost because something wrong with the site? If it is a real glitch on the site then there will be many people complaining the same think as what you do (at least you'll not be the only one).
In case if it is real bug on the site:
You did notice the bug why you did not make any screenshots when it was happened? You noticed the bug but you still continue betting as you said your browser refreshed 50 times. That's a lot of time for you to stop before the 50th refresh and find out what is happening. At least you could try to ask support (before you lost all your money). This is your mistake (noticing a glitch/bug but continue betting).
The other mistake you made, you do not provide any proofs that it was really happening on your side.
I'm very sure you will not get any refunds, if you get a refund then all players who lost their money on this site or maybe in any sites will try to do the same with you. Just take your lost, as it is not a big amount for you (you said it by yourself). If you want refund then provide proofs.