I seriously doubt that CellC will be able to create and launch a new deal to replace this one before it ends. I'd suggest that CellC seriously consider letting this one run on until they have another deal lined up.
It's been really quiet over there at CellC, and one gets the feeling that they've lost that marketing impetus (is this the "post Lars" era?).
8ta will have the high ground with their 2+1 deal if this one expires, and everyone knows how disloyal we can be when it comes to getting the next great deal.