FABO Court

OK, people of A Bodies. Judge this case for me.
I sell a firewall to a member here (HemiDenny).
HemiDenny wants the firewall cut in a very specific way, that includes many pieces that would have sold individually.
We agree on a price. $180 shipped to him.
I cut the firewall, package and ship it to him. My cost was $25 for shipping.
HemiDenny recieves the firewall and messages me back (in a very rude and condescending way) ( I will post his PM to me if anyone thinks it is necessary) stating that he is not happy, and I did not cut it as he wanted.
I immediately tell him to send it back, no problem.
He asks who is paying shipping. I said I would.
Days go by, and he messages me just now claiming that shipping is going to cost almost $70. He wants to know what I am going to do about that.
I tell him that "I paid $25 to get it to you, I'm not paying more than that to get it back.
HemiDenny then informs me that he will now go to PayPal for his refund...which would be the initial $180.
So, good people of A Bodies, how should I handle this?