I've bought 15 mhs of Zen. Makes a decent return but I got pissed off because every time, without exception, the withdrawal of BTC does not work until multiple attempts are made. I asked for my money back and they told me to fuck off. Well I am still within the window of my credit card purchase and can tell them to fuck off and there is not a damn thing that they can do. It was only $350 CDN so I may just ride it out to get my ROI as I do get my BTC eventually.
Well you have to be patient for you to get your ROI, just because you're not returning doesn't mea you can get a refund, you should roi in time, if you don't you should make close to it, you can always sell it on the hash market too.