Help! I've been charged for the same thing twice

I'm not sure how it happened but I bought Sam and Max Season 1 and 2 using Paypal and I got charged 64.90 twice. I really liked playing the game but not so much that I want to pay 129.80 for them.
I would like to get a refund for the second payment of 64.90.
Thanks!
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Comments
06/20/2008 Other AUTOMATED DEBIT PAYPAL INST XFER $64.90 06/20/2008 Purchase PURCHASE PAYPAL *DR INC USD 06/18 $64.90
Your Order ID: 7213315200
The stuff in your order includes:
• Sam & Max Season One
Your Serial Number for Sam & Max Season One:
[Serial Number]
• Sam & Max Season Two
Your Serial Number for Sam & Max Season Two:
[Serial Number]
Emails I have recieved (name has been changed to my user name)
Telltale Games
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Confirmation for Telltale Games order 7213315200 - Telltale Games June 18, 2008 | www.telltalegames.com We love you. Why? You bought some stuff! Not …
Jun 18
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Receipt for Your Payment to DigitalRiver US Inc - PayPal Dear WKK, This email confirms that you have paid DigitalRiver US Inc …
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Bank Account Confirmed Successfully - Dear WKK, Congratulations, your bank account was confirmed successfully through our …
Jun 18
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Getting Started with your PayPal Account - PayPal PayPal – The safer, easier way to pay Use your credit card without exposing your card …
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Activate Your PayPal Account! - PayPal PayPal – The safer, easier way to pay Use your credit card without exposing your card …
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Receipt for your Payment to DigitalRiver US Inc - PayPal Save Your Payment Information with PayPal Use your existing PayPal account for future …
Jun 18
Telltale Games
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Thanks for registering at Telltale Games! - Telltale Games June 18, 2008 | www.telltalegames.com Hey, good looking... Thanks for registering …
Jun 18
To find out for sure, you should contact your bank and ask if PayPal made one withdrawal for $64.90 or two. If they say there were two withdrawals, please ask for the transaction IDs of both and send those to us at support@telltalegames.com so we can look into it.