Complaint Review: Buy Merchant INC

Yesterday on ebay, I offered to two best offers to buymerchant1: $30 for twenty pairs of Mary Jane Cloth Shoes and $70 for seventy-two pairs of the same shoes.  The seller accepted my offer; I then received an invoice for the transaction and I discovered the total amount was $345.09.  $30 was for the shoes and $315.90 for international shipping.  Before offering, I checked the shipping and handling and it was $51.52, which is what it states when I check the USPS rates for Guam--Guam is a U.S. Territory, shipping rates are similar to the United States. The amount for shipping is unreasonable and informed the seller I will not pay for this transaction; the seller keeps on saying the price for shipping is correct.  While I said the shipping was incorrect; I informed buymerchant1 another seller sales similar shoes for about $35 and offers shipping to Guam as any other state in the U.S. for $35.51.  He replied that the other seller was a crook and he would not cheat me; he said the shoes he sells weighed 20lbs, which seemed unbelievable because I know those shoes are light.  As of today, I continue to e-mail them via e-bay and ask to cancel the transaction; the seller hasn't.  He sent a message saying to stop harassing them and called me a liar.  He wants me to provide proof the amount I state for shipping is right; I do not know where else to confirm this information.  However, the seller keeps maintaining his or her credibility announcing that he supplies to buymerchant.com.  This wholesaler/distributor is the same company as Buy Merchant Inc that has a website called buymerchant.com.  Overall, this seller/business should know better.  This company treats their customers abysmally; they are rude and unprofessional their actions are unbecoming of a business.