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santer 
I'm not trying to be evasive or difficult. On TUG, we get literally hundreds of 'how do I get out of my Mexican TS' requests. We give pretty much the same information to all of them. The vast majority are new posters- much like yourself. Whether they take the information and act on it, we'll never know. They almost NEVER come back and tell us how it went. Once in a while, someone who didn't read their contract and let the rescission period slip away, we've told them to plaster social media with bad reviews. Some have said they got out of their contract with the condition that they recant or remove the bad reviews.
All TS outfits treat their defaulting customers differently and ALL collection agencies are jerks who browbeat people into paying debt they may or may not owe. What they get is theirs. What you keep is yours.
Anyway. We wish you well on your quest. There is NO perfect answer, except to pay the next 4 annual fees, and let the TS expire. Buy your house and have great success.
We have done what we can do.
Jim