Shipping a broken amp back to Canada


I need some advise on shipping a broken amp back to Canada.
Bought an amp on the web from a guy in Canada.Upon recieving
the amp i tried it and has no sound coming from the left channel. I was able to get in touch with him and is willing to send me a replacement as long as i ship the amp back to him.I send it UPS ground and i got a note from him saying he is being charge $118. brokerage fee,so how can i ship my amp back to
canada without him paying brokerage fee.
thanks for any info.
coolkiko

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