Whenever having a tough conversation, be prepared to either accept whatever they offer or find a new job. Welcome to America, it is what it is.
You probably signed a contract initially stating the starting rate. You can ask for this. You may have been told the wrong starting salary, you may have been given the bait and switch. It is probably too late to change the past, regardless. You can ask for a raise of $0.50 starting current (or more likely next) pay period. They can say “it’s not the time of year we give raises” and “your would not have been told that, it isn’t our standard” etc. You can look for what their current starting rate is for the job you are currently doing and apply to the same job within the company, when asked why you are doing this you can point out you were denied market value raise.