On 14 Jan 2018 my traffic log shows more than 5000MB of traffic, which is more than 10x the normal daily usage for me, even though I did nothing other than use Mudfish with Phantasy Star Online 2 as I have been doing for the past year or so. I guess it’s the same Mudfish with CDN issue? Hope I can get a refund at least. Thanks.
When I checked your configuration history it seems you tried to use Full VPN mode. Not sure that at that point 13.107.4.50 IP is used to download or stream the contents. I don’t think this is CDN related issue if you only used Phantasy Star Online 2 game item.
I’ve been using about 15 mins of Full VPN mode with Bluestacks pretty much every day since I started using Mudfish though, which is like almost a year ago already, so I didn’t think that caused the issue. But to be honest I’m not sure. I shut down all other programs that might use significant amounts of bandwidth while Full VPN mode is on. Still, maybe that is what caused it ^^U
Okay. No problem. 
Please let me know if this issue happens again. I can restore your mudfish credits gone again.