KINPUP review for Picsio: Bulk Image Upload

There's no way this app could be unsubscribed. I've already uninstalled the app but they're still charging me. And now I need to install the app again to see how I could unsubscribe and I saw that I've already done so as stated in the billing page. And I've contacted them via email and no one responded to me....I'm so helpless. Could someone from Pics.io see this message and help me? I don't wanna pay non-stop while I just need this services for one time. And I dunno why they charge me $30 when the plan says it's only $18 per month.....I wonder if this app is a scam which doesn't allow people to unsubscribe.