I purchased PDF Element and sent a refund request in one day, as the software turned out to be pretty mediocre. The CS person offered me an upgrade to the Pro version. I said I didn't want the Pro version and would rather have the refund. Again, the request was not entertained - the CS told me to try the Pro version first and if I wasn't happy with it, they'd offer a refund.
A couple weeks later I sent another refund request and it was the same pitch again ("We can't give up on trying to help you without knowing what's wrong. How does the Pro version works for you?") When I insisted they should honor their 30-day refund guarantee and the customer service promise they made (about refunding my money if I didn't want the Pro version)... Radio silence. The CS person simply ignored my messages. Didn't bother to reply again.
DO NOT BUY ANYTHING FROM WONDERSHARE!