I'm no lawyer, but thought I'd throw this at the wall to see if it sticks.
What about telling them you've got an attorney now and he's advised you to pay. The attorney just wants a copy of their deposit slip showing where they deposited your two months deposit within 14 days of signing the contract into Banco Agricola. If they never did that (99% don't) the contract was null and void.
If the contract is null and void (Which I'd bet it is) I'd think It also might make them take pause in proceeding because I strongly suspect they're bluffing. Also, in court (* North American court so there's a big asterisk here!!) usually as a plaintiff you must show you're coming to court with "clean hands".
Again, I do not offer this as legal advice rather food for thought.
Discuss...
Just pay what you legally owe and get it in an affidavit to shut the landlord up.
Playing games in DR like bluffing etc. is just REDICULOUS. There is due process, but why chance any problems. God knows who knows who to get an embargo on your furniture (btw, that is what creditors do HERE first.)
The have to send you to collections (a lawyer). You need be notified and have a window to resolve/contest. If you DON'T respond, then they can send you another letter "threatening" to embargo your IMMOVABLE assets first (like furniture). If still you don't respond, well... that's your call.
For someone to seize your bank account or house here, you must owe ALOT of money to the wrong people (like the BANK). And still, the process is long and drawn out.
FURTHERMORE:
A contract is so NOT null and void here or in the States due to a technicality. You were living there! There is a non-written verbal contract and that is 110% enforceable. Just like in any business deal: emails, conference calls, your ACTIONS etc. are solid proof.
In the States, the courts almost always side with the tenant, even in the most absurd situations. It's more or less the same here.
There is an "understood" clause in any rental agreement: you need give notice to vacate and if you do not, you "may" forfeit your deposit. Living out a deposit is not a "legally acceptable" payment of rent.
If the landlord is smart, he has a laywer and can get months you "lived out" PLUS the extra 17 days PLUS any/ALL associated fees.
Bottom line: You may choose to blow this off and nothing happens. OR maybe they will go after the Fijador. Maybe not.
I just don't get all the advice and back and forth. There is no doubt. You simply owe. It just isn't clear exactly how much (all depends on what you settle with the landlord).
Why chance the landlord going after your Fijador????