No, you don't understand. The $30 was not a hotel charge. It was a charge for buying points.

So did you not get the extra points back that you bought for $30?

This is not a true cash+points program. It just a disguised way of buying points at the same time you make a reservation. Once you say "ok" to the $30, the $30 doesn't exist anymore, and the hotel is booked will points the full points.

Ie, if it says the hotel XXXXX points per night, or 10k + $30 points per night, the $30 is simply buying the difference between XXXXX and 10kl, and then reserving the hotel for the full XXXXX points per night.

So what we're asking is how many points you got back. You should have gotten way more than 20k points back (in exchange for not getting 2x$30 back).