What to do next? Do i need an additional sponsor? What must be the income of that sponsor?

You may be more likely to get a helpful response to this if you repost it under the Immigration law practice area.

Assuming you are an employee at will, then yes, you can be terminated in this situation.

You posted this under employment and labor. I am not clear that there was any employment related issue here.

You should provide the DOL all the information and evidence you have, and file an appeal if needed of the denial of benefits.

I was retaliated and discriminated against for asking about back pay, what are my rights ?

You may have a retaliation claim that can be pursued with the DOL. Here is a link with some more information that may be...

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What actions can be taken if my boss puts his fist in my face twice while trying to chastise me

As the prior posts indicated, if there is an HR department, that should be your first step here. Beyond that, while there may be a claim for...

Anyone will need to review the non-competes you have with both companies to be able to answer this, but you may have an issue working at both...

You certainly can, and likely should do so, if they aren't going to fix the situation.

In most scenarios, a company is not required to offer severance and can, in exchange for offering it, require the signing of such a document.

Your having put in for resignation prior to having made the request complicates things here for you. Generally, you cannot be terminated for...