Trying to get out of Mexico timeshare

I bought a timeshare in Cancun several years ago. I tried to sell it for almost nothing but no one wants to buy it. It is all ready paid free and clear but I have to pay $750 every odd year. What happens if I decide not to pay the association dues? I’ve all ready told the resort I no longer want the timeshare but they said they will turn me over to a collections agency if I don't pay the dues. Is that true? Will not paying my dues hurt my future credit scores?