Lower face/necklift with platysmaplasty fail - can this be fixed? (Photos)

6 months post lift with platysmaplasty. Used some sort of revised corset using individually tied stitches rather than a running stitch which could potentially come undone. I was told initially I would not need to have platysma muscles botoxed ever again. I have had to do so, unfortunately, but am finding it still looks loose. Had two cool peel sessions and one RF treatment elsewhere.