After speaking with the rep last night they "upgraded" me to the unlimited plan for 10$/month. My speed won't change so I'm staying with FIBE 50/50 (FTTH) but after speaking with the rep, it is not a "true" unlimited plan. From what I understood, they upgraded my limit from 250GB a month to 1000 GB a month. It is still good but if someone goes over 1TB of download/upload in a month, I'd be curious to know what would happen.
I called in and replaced the 15/10 I had with FibeTV for 25/10 Unlimited for FibeTV. Unfortunately it seems it won't get changed until the 31st for some reason. Either way, happy to have the speed increase and unlimited usage now.