Hello, I have a question regarding my visa situation🙏🏼

Year 2021 I had a 12 month business visa. I quit my job and left the country

Came back 2 months ago on a visa exemption and when it was time to make the 30 day extension, immigration office rejected it because I didn’t “cancel” my business visa properly

They say I need an official letter from my previous employer with a stamp, then go to immigration and get a cancellation stamp..

Now the problem is that this company have been ignoring my messages & calls from last year..

I tried to reach out multiple times but it’s a dead end. I can’t get this official letter…

Is there any workaround / solution to this?

Thank you, all help is appreciated