You can only post a rebuttal on ratings posted to your account You cannot post a rebuttal to rebuttal made by the other party on your original rating of them.

Making sure of the proper shipping address is the responsibility of both buyer and seller. If you find a buyer who has one address listed in his RCU account and yet a different address in his Paypal account, you should be sure of which one he wants you to ship to. OTOH, it is the buyer responsibility to be sure all of their information is up to date in all of their online accounts.