I got a call from them about 6 monthes ago and they paid me for my timeshare.  I believe they work for a phone room with different campaigns.  I am guesing.  I have never received another offer of any services.  I own at Disney so my condo is easy to rent.  I guess it depends on where you own too.

also got a call this week  about this.  said he had my timeshare rented to call to confirm....did not return the call? Do you really think that it is for real? also "my envelope details" said it came from  978-570-2369.

Got a call 1/11/2010 from the same Mark Williams saying essentially the same thing as number one above.  Said he has a group wanting rentals in Cancun in April.  Have not done anything.

I got a call from the same number.  They told me to make a reservation first, but we dont want to rent.  We use our timeshare every year.  They did not ask me for an upfront fee!

I received a call from someone (a male) leaving the same number.  I called and the asked me if I had a timeshare and if I wanted to rent it out.  The person I spoke to was female.  As she began to collect information about me I asked "Who is Global Services".  For some reason she couldn't answer this question.  Another person was placed on the call and also could not answer the question. At this point I hung up.