I'm a nurse and since I started the job I have had to cover on-call duties. Can I refuse?

If this designation is not specified in the job offer or the concluded contract, you can reject it.

Dear Ma'am,

You are required to carry out duties as per your job description that you may have signed at the time of recruitment.

In case of any further clarification, please do not hesitate to contact us.

You must review the employment contract between you and the terms governing the relationship.