He has been late to pay his half almost every month. I would like to change the ownership to a sole ownership so that we won't share financial obligation. I don't want to own it but he can't pay solely I don't mind taking over the ownership. I have asked to respond to my request numerous times but he hasn't responded. What can I do? What type of lawyer should I speak to?
Courts have no power to change property divisions after the fact. Your agreement is your agreement and you cannot, without his agreement, do what you want to do.
Your decree might give you some remedy as it relates to recoupment of his half of the payments. However, the obligation itself would most likely be governed by Mexican law so you might talk to a lawyer versed in foreign law.
You're definately between a rock and a hard place. Taking your question at face value, there is nothing you can do. Your divorce resolution is cast in stone and I wouldn't recommend throwing good money after bad by taking your ex back for a contempt hearing as it may just be an issue of not enough money to go around.
I recommend you look beyond your question and determine whether the timeshare has any resale market value, many of them do not. It may be the best answer is for you and your ex to work together to get rid of the interest or consider a strategic walkaway. Our firm does provide assistance to clients who don't want to continue to support their timeshare interest but don't want to be on the wrong end of foreclosure litigation either.