IBERIA, an absolute disgrace!!!

I have been trying to get my refund from IBERIA since 02MAY18. My airfare was paid in full prior to my flight, even selected my seat and paid extra for that too - booking was done online and therefor it was all paid in full in advance, even got my boarding passes! On day of departure, at check-in counter I was told that there was an amount outstanding on my reservation. To my dismay, I was forced in paying additional fees otherwise, I was told, that I was not allowed to board. After all of that said and done, the seats that I pre-selected, booked and paid for was also not available!!! When I inquired, I was told to take it up with IBERIA at their offices. At IBERIA's office at Madrid Airport I was told to do it online. I have tried in no vain to get a response beyond just replying that my claim has been registered and that IBERIA will contact me in 21 working days. Today, 4 months later and IBERIA still owes me a refund. IBERIA is an absolute disgrace to such a lovely country.