I got a 1099-INT from him to file my tax, which I paid a big portion out of 8% (effectively around 6% after paying the gov). 

.- Have they filed a police report?

Any taxes not owed, a seller merely file a tax return with the state, just like any other tax returns filed for extra taxes a government has with held. 

Finally I came to my senses and served them a 'Notice to pay rent or vacate by the 10th of January' after which I plan to file an eviction.

The short answer is: file form 1099-NEC. 

It is not legitimate and I do not legally owe this balance, but have been unable to get it removed from my history unless I file suit against the company.

For separate entities I use separate files for each entity.

The repayment terms for a 401k participant loan are equal monthly/quarterly payments of principal and interest (typically prime plus 1%) over a 5 year term (longer if used to acquire your principal residence).Please note that if you take a full $50,000 and then pay back the loan, you can't take another $50,000 until 12 months after the first loan was fully paid back.Per the loan offset rules that went into effect with the 2018 Tax and Job Act: if you leave your job and the loan is current at the time you leave your job but then the loan goes into default because you left your job, you will have until your tax return deadline (including any timely filed extension) to make the loan current by depositing the outstanding balance into an IRA (and thereby avoid the taxes and penalties that would otherwise apply).Please keep in mind the multiple loan rules:Under those rules, the sum of the balances of a participant's outstanding 401k loans under a single 401k plan (using the highest outstanding balance of each loan over the last 12 months) can't exceed 50% or $50,000 whichever is less.

However, once you file your taxes, the IRS will figure it out and you're screwed!

She did not, so I filed the writ.