Great!!!
Server down for 5 days for maintenance!!
------------------------Quote----------------------------
Hello Dear Customer,
We are undergoing a system maintenance from 2018/06/07 20:00 till 2018/06/12 00:00 Hongkong time.
During maintenance you will be unable to login or access wallet.
We apologise for the inconveniences caused.
Please check after maintenance

I had report the issue on 9-May-2018, and notified the issue was received on 12-May-2019 (Without any support case number)
On 16-May-2018, I sent another email asking for the status and there is no reply any more.....

Here it is my issue:
I just brought 93000 GPC with 6ETH + 0.06ETH (for trade cost)
Before buying, my account should have ~11.166 ETH
After buying, my ETH balance become 4.9259ETH
Is my maths sucks? 11.166 - 6.06 = 4.93 !?

I have a trading issue and there is no support contact method available on https://gpcmining.com/
I had send an email to gpcmining03@gmail.com to report the issue.
Look forward to your reply.

If the above email is not correct, I can post the issue here.