Job title says Graphic Designer, but I think I'm getting f*cked?

Hey all. Hoping for some help as I feel like I am getting fucked at work:

I joined a large company in Seattle about a year ago where I was hired on as a Graphic Designer. Through the interview process they mentioned that they wanted someone to "help film and edit small, simple videos" for the marketing department in addition to the usual logo, print, and digital design. That was perfectly fine as I had the relevant experience, but throughout this past year I have progressively made more and more videos until that is the entire extent of my work, day in and day out. To clarify: I am no longer doing the typical design work at all and am, in fact, filming with professional studio equipment and editing lengthy videos on a daily basis. My pay and job title have not changed to match what I am doing and I am at a loss of what to do. How do I get my title and pay to reflect my actual work? Do I wait for a title change and hope a salary boost comes with it? What would my title even be at this point?

TL;DR: Hired on a year ago as a Graphic Designer, but am professionally filming and editing marketing videos instead. What can I do to be payed and get the title I deserve?

Great design resource

100 Things Every Designer Needs to Know About People (Voices That Matter) Submitted February 04, 2019 at 07:41PM by SuperSailorSera http://bit.ly/2Sdrfen