Jehovah's Witnesses: In Isaiah 43:10-11, YHVH says that no god was formed before Him and after Him no god.....?

will be formed, and their is no "savior" but Him (YHVH). What does this mean if there is no "before Me" and no "after me?" Why would God say after me unless He spoke of a time He is formed? Why would He proclaim that there is no Savior but Him if He made Christ savior in the New Testament? Do you even know what I write. You pride yourselves on the sharpness of your little daggers; come test them on my sword of the Word and I promise to sharpen you.