Someone help me EBAY problem!?

I'm a college student and i usually rent my books for every semester since is cheaper so there is this website called HALF.COM which is partners with ebay. so i rentend two books from an user and one of them when they sent it it was SUPER used. Every chapter was highlighted and i personally didnt care... show more I'm a college student and i usually rent my books for every semester since is cheaper so there is this website called HALF.COM which is partners with ebay.

so i rentend two books from an user and one of them when they sent it it was SUPER used. Every chapter was highlighted and i personally didnt care because i don't care about the conditions of the book as long as im able to read the information.

So now they charge me 171 dollars for a book the cost 120 general price and they took it out of my bank account without my consent. Also the other book that they rent me was brand new and it was returned just like they gave them to me.

what can i do to get my money back because is NOT FAIRR!!!!

please help! 170 is an entire paycheck or at least for me =/
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