Can the employer ask the employee not to serve the notice period upon resignation?

Hi Madam!

I have been working in a firm for the past 2 and a half years. In April 2021, I went to India for one month vacation.

Due to the Corona crisis, flights have been suspended until August.

In June 2021, my visa and labor card have also expired. As per the UAE government, in August I came back to Dubai and started working.

Last week, I resigned from my company. They informed me that I don't have to stay the notice period and they will cancel my visa in 2 to 3 days.

But to date, they haven't started the procedure.

Kindly advise If there will be any fines imposed against me.