Google this!
"Regulation (EC) No 261/2004 of the European Parliament and of the Council of 11 February 2004 establishing common rules on compensation and assistance to passengers in the event of denied boarding and of cancellation or long delay of flights, and repealing Regulation (EEC) No 295/91 (Text with EEA relevance) - Commission Statement"
Then revisit your grounds for complaint! If the airlinr took allreasonable care to look after you, and it appears it may have done then you may not be successful. There appers to be a good many "get out clauses"! Good luck.