There is withdraw mistake, on amount "null" is the only option and I cant change this
There is more issue on their website. Wondering how they launch their website with so many problems. They are claiming that there is bug issue, but so many bug is not good way to operate this kind of site.
I would like to suggest please resolve
this Scam Accusation against you. Better recheck your website if really there is bug issue. You might keep your website under development till working fine.