Lost ability to travel to sites since Marriot acquisition of Welks Resorts

When we bought our 1 BR Welk Resort timeshare a number of years ago, our contract was in terms of "week(s)" which enabled us to visit any of the (7) resorts without any issues. Since Marriot took over, they converted our 1 BR into their points system giving us the equivalent of 140,000 points. With these points it has now limited me to go to only 2 of the 7 resorts as most of the 1 BR's start at 180,000 points. How is this fair and not a breach of contract?? I paid for the use of 7 resorts and now only can go to 2. Has anyone else been left in the same situation or managed to get their point system honored to match what we truly paid for or had access to previously?