Hello all. Before BA gets back to me I'd like to get opinions here.

I wanted to book a flight INV-LHR LGW-MCO using my 241. At the time I logged on to do so the phone lines were not accepting calls as they were too busy. In order to not lose the long haul reward seats I booked them on their own.

On calling at a later date to add on the domestic connection I expected the taxes to recalulate to reflect the lack of APD when flying from INV, resulting in a refund by my calculations of approx £276. However the agent calculated them at an extra £17 each instead. When I explained the situation it was a, "tough, this is what I've calculated them at, I don't know what to tell you" type scenario. Wondering if I'd made an error somewhere, I booked a domestic from ABZ instead which is slightly more convenient, but we were willing to have a short extra drive in order to save £276in APD! The ABZ flights came out at an extra £12 in tax each.

My question is- am I in the wrong here? It doesn't seem fair that if I had been able to book online I could have had my Inverness flight and paid the lower tax, or am I misunderstanding something somewhere?

Thanks in advance for thoughts!