This is more of a tip than a review.
If you want them to stop calling you, tell them your income is less than $25,000.
That being said, they'll tell you unfortunately you don't qualify for their services/timeshares, ETC.
I make way more than that but when they called me and wouldn't stop harrassing me and then asked me about my income, that's when I told them "it was around $25,000". They said "Oh, unfortunately, we have minimum income requirements" and wouldn't be able to offer me that "Free" vacation.