Repair of a cobra neck deformity. What would be the best option?

If you are referring to redial bands with a central depression under the chin it is a perplexing problem for us. An exam must be done to distinguish what structures are causing the problem and a review of the operative report from your surgeon to see what was done originally.  It has been my experience that to struggle with the muscles in the neck in the face of loose skin is not fruitful. It may in fact be necessary to redrape the skin with a lower face and neck lift. 

As the other doctors have mentioned, it is very difficult to give a proper diagnosis and optimal treatment plan without examining you but what I commonly have seen is removal of excess fat centrally in the neck without treatment of the submandibular glands which gives the appearance of two lumps on either side of the neck with a central depression below the chin.  The solution is a neck lift that involves contouring the deep space of the neck which includes reduction of the size of the glands along with treatment of the deep fat and possible digastric muscles in addition to a platysmaplasty.