It's possible that a lawyer may take your case and seek fees from your ex-husband for you having to file a motion for enforcement with the court. If your ex-husband is wealthy and he clearly violated the decree, then the lawyer might be satisfied that he could get his fees paid by your ex-husband either willingly or by force from a judge.
They should have created an estate for your husband if one didn't exist. You can sue for wrongful foreclosure and ask the eviction court to stay the eviction proceedings pending outcome of the wrongful foreclosure suit.
Generally the HOA lien will be wiped out the foreclosure and the bank won't care about the HOA assessments due. The bank will have to pay the HOA fees after foreclosure if the bank buys the property at foreclosure, or else the purchaser of the property will have to do that. The purchase by the bank or another purchase won't be subject to the extinguished HOA lien, but again, new HOA fees will be due and payable.
The other attorneys are correct. Instead of asking them for a cute to a specific statute, you should simply decide if you want to buy out the person you don't like or ask a court to partition the property by sale or physical partition.
Although their threats may be scams, your underlying loan wasn't a scam, so be cautious. There actions appear to violate state and federal debt collection laws, for which they can be sued. You may want to retain an attorney and go on the offensive.