I read the statute and it appears they have validity in their argument.

If you want to dig into the weeds and review all the legalese of who is required to have a NC broker's license... read  NC General Statute Chapter 93A Real Estate Law, more specifically section 93A-2 - Definitions and exceptions.

You should also review the OR statute on notice, auction, proceeds, etc.

And you WOULD have to prove actual knowledge.Aside from the statutes, case law plays major factor in what really applies to your case.But the 1st hurdle is to determine ability to recover. 

Account Closed you need to read your states statutes and how long of a notice must you give, how much can a landlord charge (here in Florida) it is a total of two months damages, and did the owner attempt to  Re-rent the property?

Some states have no statutes allowing for mortgage redemption after the sale, which means, as far as they are concerned, the foreclosure sale is final.

Quote from @Marcus Gaethke: Find another attorney because these guys don't know your law or they just don't want the job.Here's your statute: https://law.justia.com/codes/w...There are paragraphs in there detailing your authority to remove someone that violates terms of the lease.

I don't think 83.49(3), Florida Statutes mention how it can be returned if it's returned in full.

That is clearly not allowed under the statute. 

The kinds of retaliatory acts covered by state statutes include:terminating a month-to-month tenancy or refusing to renew a lease, and following up with an eviction lawsuit if you decide to stay and fight"