I assume you are claiming on the partner airlines page for missing Avios and have entered the ticket number as well as the QF flight numbers?

I also assume the flight class is eligible to earn TP and Avios and not like theP Class issue that affected Cathay Pacific flights until recently?

What reason does Qantas give for the rejection?

I would probably make a complaint via the BA website and attach sca s of your boarding passes and mention that Qantas keep incorrectly rejecting the claim.

I'd also mention how many TP and Avios you are expecting to be credited.