Lastminute.com and British Airways poor service

My wife and I paid 519 euro in additional fees for a British Airways return flight, to have seats with extra legroom. BA did not give us the seats we had prebooked and lastminute.com refused to refund us or get us our prebooked seats. It seems that lastminute.com is running a **** to get people to pay for prebooked seats without actually booking it for their customers. Please be aware of this issue when considering lastminute.com