If you need testers you don’t tell them to pay for your service and you’ll refund them, you give them free access to your service. Otherwise this appears to be just another low level scam attempt where testers buy ads and then you disappear without refunding. I get you want people to test this for you, but if testing the payment system is what you’re going for, maybe you should send funds yourself instead of asking others to do so for you and expect you to send them their money back.
it seems more like a begging here for $0.34.
OP, your website is just 16 days old. You can't expect a big profit for such a short time. (you cannot expect any profit in such a short time).
You had 2500+ active users, did you do an analysis, what kind of users are they, how long they stay on your site? 2500+ unique visitors can be a solid base to start earning from there without begging.
present your service in the right way and try to do a little research about how to monetize the faucet website.