Husband writing to the wife "I DIV you"

In May 2014 I was issued with my first divorce (but my husband wrote I DIV you). I was not present in the same room when he wrote it. Then around the end of May he issued the 2nd one same thing he wrote I DIV you, I was in his presence when he wrote it. Then end of July 2 days after eid he issued the last 1 also I DIV you. I was not present when he wrote it. I then started to sit my Iddat, we did have intercourse twice during my iddat period, but never got back together. I want to know now am I divorced was all 3 valid?