I ended up buying the expansion twice, for one account!
I assumed when it said "quantity 2" it was referring to the bonus point bundle I thought I was buying aswell.
Turns out I bought no bonus points and 2 expansions...ugh.
To make it worse I didn't realise my error until after I redeemed the codes and noticed my TP value seemed off.
I can't really benefit from having 2 expansions on one account, I'm hoping I can just give back one of my expansions and be refunded.
After all, I notice I only have one bonus item pack in my inventory (which i deliberatly have not activated yet).