Call from Global Travel Services saying they have rented  my timeshare for $3500plus only need me to book a week at Hyatt Regency Cancun for June 18-25 and pay them $199.00 for each week I am willing to book.  Said they were located in Huston TX but reverse look up for phone number 918-442-0655 says it is in Tulsa, OK.
Scam!!!!!!
Has anyone ever had any luck selling or renting a timeshare?

No, don't have a timeshare, but congrats on wisely investigating and avoiding this advance-fee scam.

I also had this service call me.  It doesn't seem legitimate, but wanted to hear if you ever followed up with them

JUST GOT A CALL FROM GLOBAL TRAVEL SERVICES SAYING THAT THEY WANT TO RENT OUT OUR UNUSED TIME SHARE WEEK FOR $3400.  WE ASKED WHERE THEY GOT OUR INFORMATION AND WERE TOLD IT CAME FROM RCI OR II.........WELL WHY WOULD THESE TRADING COMPAINIES GIVE OUT OUR INFORMATION?? IT DOESN'T SEEM LEGIT, BUT WE CAN'T FIND ANYTHING IN BBB OR GOOGLING???  WE'RE GOING TO CALL THE TRADING COMPANIES IN THE MORNING AND WILL TRY TO VERIFY,,,,,ANYONE HAVE ANY INFO??

I think they are all trying to scam people.  Think about it. Why would anyone pay $3400 to rent a week they could book on their own for less than $1000?  Makes no sense.  Personally would not take the time to make the call.
I am so tired of getting these kind of calls.  Wish there was a way to stop them from calling. Seems to be same scam with just using a different name every time.  They will say they are calling from Las Vegas and if you do a telephone number reverse check it will not be a Nevada area code.