NO - change brokers.
If you order a steak off the menu and it is listed for $10.00, would you accept the bill for the steak to be $50.00 when it comes to the table.
Brokers in most states must have a WRITTEN and SIGNED Listing Agreement if they are talking up a property. Now, if it was over several weeks and months between communications, it might LOOK like the same time share (both for 2,500 points at the same resort) ... but you used the term "suddenly"... sounds like he figure you were NEWBIE and DUMB ... he is gonna "take" you.
PS Usually the price of timeshares goes DOWN, when you talk to someone who is selling one.