THIEVING AIRLINE MULTIPLE OVERCHARGES BUT NO SEATS BOOOKED

I booked a flight on the 25th of August from Seoul to South Korea for my gf and myself. Ever since then it has been headaches. Even after I sent them proof of payment thyr could not find my payment on their system. Then the seats I had booked and received itinerary confirmation for, suddenly disappeared. After over 15 calls and emails back and fourth, STILL this has not been resolved. I checked today and AGAIN one of the booked seats on our flight has mysterisouly jdisappeared. Teh office in Korea confirmed that I was overcharged and that a refund is due, but the useless call centre is none the wiser and EVERY new agent I speak to, has to be explained the whole story - WHY THEY CANNOT PUT NOTES ON A CUSTOMER'S ACCOUNT is another story. Today I chedk online, AND again the seat is GONE! TWITTER, FACEBOOK AND EMAILS are useless. WHO can I contact to get this resolved??? I don't want to arrive at the airport on the day only to find there is no seat booked or my girlfriend and I cannot sit togetehr on this long flight. Your service is utterly putrid!