I (so far successfully) swore off of Hertz in 2015 after losing all my points. At the time (based on my emails to Hertz), the T&Cs indicated that points didn't expire as long as points were earned or redeemed in the previous 24 month period (I knew I was coming up upon expiration and had read the T&Cs with a fine tooth combed). Hertz wrote back and made up (at the time) a new rule that the earning or redeeming had to be on rental activity, not a bonus promotion. After I pointed out that rental activity wasn't in the T&Cs, the stopped responding and updated the T&Cs.