End of 2015 I wanted to advertise as an advertiser on clicksor and they told me that $1,000 was the minimum but if I wasn't happy with ROI I could request a refund. Traffic is the worst that I bought, though I buy in about 20 other ad networks Normally my bounce rate is around 40/60%, that's normal. But with them it was everytime at 99,9% lol That's mean nobody visit the website because it's only fake. When I wanted to stop and request a refund I still had about $850 in my account. And since I have spoken with lots of people but nothing is doing and they are no longer responding to messages or to skype the last days .... That's just my experience with them.
Request chargeback/refund via payment provider you've used. I also had similar problems with them ended up by requesting chargeback from a credit card provider for a quite amount ($X,XXX). Since then, all I get is threaten emails (lawsuit and similar shit). I expect that every network should be transparent with me when I ask directly and they weren't. Promised me similar thing of what they've promised you and didn't do nothing regarding that matter. I did.
Thank you for your message ! Unfortunately it's difficult when it's a service to get a refund with paypal, they say to contact the seller directly...