This is interesting, because it's a turnaround if so.
I booked with AerClub Avios for flights in February and when I called Aer Lingus they said to contact Avios to book the seats. I called Avios who said they were never able to book seats. Figured I'd got a rep who got it wrong and called Aer Lingus back. Next rep at Aer Lingus specifically said their management had instructed them not to book seats on Avios bookings and they'd get into trouble if they did so. Back to Avios where they said they'd see what they can do. A week later, no joy so I cancelled, received a refund for everything (which had been promised, so well done) and rebooked with BA instead.
Hopefully my moaning blogs about the hour I spent on the phone during four calls ping ponging between Avios and Aer Lingus and my follow up blog about how ludicrous it was not to be able to book seats on an AerClub Avios booking when that booking was on Aer Lingus was listened to. That being said, Avios said they'd escalate it as well as they thought it was strange themselves, so one way or another it seems to have been resolved.
I don't have any issue with paying, my issue at the time was the fact I couldn't book seats at all!