Welcome to our Community and thanks so much for your first post; I am sorry that you replacement SIM has been delivered to an incorrect address. These are usually just sent to the address we have listed for your mobile account.
If this is different now (if you have moved for example) then we can get this updates for you and get a new SIM posted out for you.
I have located a few mobile accounts under your forum information so I'll pop you a quick Private Message so we can ensure we have the correct one and go through security with you. Please do look out for the Purple Envelope and pop me a reply when you can.