The WT reads an awful lot into this scripture (Zeph. 3:9).
Another scripture that may have a bearing on the understanding of it is Hosea 2:16, 17: "In that day," declares the LORD, "you will call me 'my husband', you will no longer call me 'my master.' I will remove the names of the Baals from her lips; no longer will their names be invoked." (NIV)
NIV footnote: husband...master...Baals. A play on words. Of the two Hebrew words for husband, one (master) is identical with the name of the god Baal...There will be such a vigorous reaction against Baal worship that this Hebrew word for "master" will no longer be used of the Lord.