I purchased Ukrainian Air and Delta airline tickets through AirTreks. Both airlines cancelled the flights. I requested a full refund from AirTreks. AirTreks offered a partial refund explaining that there were unrefundable fees and booking fees from the airlines and AirTreks ($1792.80 of the $5804 was unrefundable). I asked for a statement listing who (Delta, Ukrainian Air, or AirTreks) was not refunding what. AirTreks wrote back that AirTreks are package deals and they are unable to give me a breakdown and that I am lucky to get back what I did. Is this reasonable?