Some time back, I was on a trip DUB-LHR-SIN (same ticket). Had 2 checked bags, and Aer Lingus tagged them through to SIN but they were unable to issue LHR-SIN BP, and asked me to get in LHR.
At transfer counter in LHR, QF/BA decided to charge me for excess baggage if I wanted my BP (It was forced really, since I could not retrieve my bags otherwise I would miss the flight), despite QF allowing me to have multiple checked baggage. Was charged £100, though QF website only listed A$120 for any additional baggage.
Made a complaint to QF via snail mail, it was replied 3 weeks later with a generic letter with no name or signature and totally no effort to investigate or checkup on what happened. It was a reply for the sake of replying. It made me extremely peeved. I gave additional feedback, and this time, it was later responded to with a phone call and subsequent letter, accompanied with a A$200 voucher, and a promise to investigate with their ground staff in London. Nothing heard from after that.