Recently my manager left the company, I am the only employee who worked under him and also the only employee who knew the details of half of the things he did/worked on. As a result, I was asked to take on his responsibilities upon his departure. I was promised a new title and a pay increase.
Fast forward to today (1.5 months later), I still haven't received said new title and pay increase. The company is currently undergoing a decent amount of restructuring, so it isn't surprising that its being delayed, but I recently found out that the raise also wont be retroactively applied like I assumed because I technically haven't been promoted in the system yet. Now it feels like I've been slighted out of almost 2 months of extra money that I should have received if the company wasn't being slow about things.
Is it reasonable for me to demand that money? And if so what is the best way to go about asking for it?