Employer pressures the employee to return after cancellation to rectify mistakes

Hi,

I used to work in a company (clinic) as an account manager. In August, the employer terminated my contract orally and I acknowledged the termination via email.

On 13 Sept 2021, my visa was supposed to be canceled but they requested me for one more day and I agreed. So on the 14th, they canceled my visa. Before cancellation, I received my final settlement.

I joined a new company and I am currently employed by the new company and my status has been changed. The ex-employer offered me a couple of times to come back but I refused.

Now they are aggressive and they are pushing me to go back to the office as there are some issues in the accounts.

I would like to know what should I do in this situation, as my ex-employer is really giving me a headache. I will appreciate your help.

Thanks in advance for your quick response.

Best regards,

I.