I have been an employee for about 2 years with this company and never worked on weekends and now they are telling me it's mandatory to work the Saturday's that they schedule me. Can I refuse or do I have no choice in the matter?

We would have to review the terms of your employment contract to determine if you agreed to allow for a change in your days/hours of work. If you did not agree to such in your contract, this may amount to constructive dismissal of your employment. Please contact our Firm for a consultation.