Merging Licenses After Upgrade

I have recently upgraded to Total Security 2016 but I had 60 days left on my Internet Security 2015 license.


I have contacted support but only received a couple of automated replies. Nothing seems to be happening now after a week.


How do I go about merging these licenses?


At the moment I am losing days out of both at the same time.


Starting to regret upgrading - never had this issue when I simply renewed the same product type...