Too much work for job title - Billing Specialist Express Scripts Employee Review

When I first started with this company in the Billing & Enrollment Department we were given the work we were trained on. After Covid all that changed and now it seems we are given work that should be done by another department that is at a higher pay scale. Almost feels like we are doing management or supervising lead work load and too much pressure for the pay scale.Every week is something different and never consistency. Plus new hires are getting hired in at the current pay most of us that have been with the company 2 or more years are at and that is not fair. When we started out it was around 15hr hired in and most of us now make around 18-19 hr which is what new hires with less experience are making so I feel that our pay scale should be increased taken that into consideration. As inflation costs are rising and it’s not fair that a new hire makes the same amount as the ones with years of experience