Regrettably, I have to say your prospects are probably not good - but I would urge you to keep trying. While the airline is almost certainly entitled to refuse to refund the basic/pure airfare, it is not at all clear cut about the fees (some maybe, not all of them) and least of all the taxes. What I know of past practice points to airlines routinely pocketing the lot whereas the taxes are collected in advance for government agencies - in this the airline guards itself against liabilities arising once you fly. In actual fact, the airline pays taxes for the passengers actually on the flight that has taken off (not if the flight is cancelled and not for those who are no-show). In strict legal terms, the airline cannot justify charging taxes which they will not ever have to pay. I would suggest you contact any consumer organisation (Which, Citizens Advice Bureau, Consumer Direct, etc.) for advice because they may know of legal precedent in the courts, etc. I regard it significant that you have had no clear response from the airline - this sort of reaction is common among many companies, all sorts including credit card companies, they try to kill the claim with inertia. You should put your demand in writing (preferably by registered post) - when doing so ask for a full refund and let them cut it down to taxes only if they want. But after this you should have a response you can quote, or not if they fail to answer. Good luck.