Job role is different from what the employer told the employee

Dear Mam,

I am currently working in Ras Al Khaima as a limited contract staff. Currently, I am in probation period and have finished my 4th month of probation.

In the present condition, the job role is different from what the employer told me at the time of joining. I would like to know, am I able to resign after my probation period? And should I pay anything for my company?

And will be there any problem for submitting resign before the completion of my contract?

Kindly requesting your advice,

Thank You!