Hi all,
At the end of this month around 12.000miles on my qantas frequent flyer are going to expire. I know is a ridiculous number for many of you guys but are the only miles I got so far.

The problem is that I cannot use them because the cheapest fly I can book cost 14.000miles. I don't want to buy miles as well because the price of 2.000miles is more expensive than booking the same fly (but different flight company) I can book with those 14.000miles.
I'm the only one to blame because I didn't pay any attention about claiming miles when I was flying the last year or I even rented a car when visiting Australia. Also I didn't keep any receipts to claim them now.
Does someone knows how to extend the expiration day without cost?
For example, registering in a webpage, filling a survey, installing a phone app, etc.
If I happen to get even just 1mile from someone does my other miles expiration day would be extended?
In the worst case, is there any way to sell those miles even for a small price?
Any help is greatly appreciated.