Bad Leads with no remedy for refund

So i've been getting 2-4 leads a week and most are from asia, allegedly in my area, don't answer the phone ever, never replies to emails, texts, or voicemails. I'm forced to pay a fee when they email me. And frankly i dont want many of these leads because I know they're scams. i request a refund, thumbtack tells me to eat cake.

I set my limit to $100/week, suddenly i'm getting direct leads bringing me up to $150-$200/week.

Again, ALL bad leads. i just had 3 people in 24 hours contact me by thumbtack. none spoke english, none wanted a trainer. I woman even said by text, she never intended to purchase a trainer, just looking. thumbtack refuses all my refunds. i dont care about the policy this is WRONG

IN SOOOO many ways.

When a lead comes in, how can i keep from having to pay for it if I have a bad feeling about it before i ever reply or anything?