My latest Avis headache is failure to post bonus miles for 6 rentals during a recent promotion. The basic miles posted promptly, but no bonus, even though I qualified under the T&Cs.
I called BAEC - they said I had to take it up with Avis. I e-mailed Avis, quess what, they said I had to take it up with BAEC. Called BAEC again and the issue has now been sent to the back office. So we'll see.....
Strangely, under the promotion that is running right now I am getting basic plus bonus no problem.