I've been charged double for my item and the seller won't respond to my queries for explanation. Any advice, please?

[m00nflowerhfx]

Item listed as approx. $75 with $10.50 internationalshipping charges.  

[pjcdn2005]

If you paid through Paypal you should phone them and try to clear it up that way. The seller has no way of charging you more than once so it must be a glitch.

How can you tell that you paid twice?