Formal complaint about airline

ON 5 May 2012 my family and I travelled from Majorca airport (PMI) destination Marseille with Ryanair flight FR 5198, at the gate my children (Arturo and Alessandro aged 10 and 12 years) were denied boarding because a rude ground staff officer considered the children's hand luggage was oversized because a little pressure was necessary to let them slip down into the bag sizer and consequently dragged us out of the queue for further humiliation! We know and respect the Ryanair policy, my bag and my wife's hand luggage were considered OK but they decided to incriminate our children.
I replied to the officer (a young woman) that we're frequent flyers with Ryanair and that this was the first time the “baby” luggage had been refused; it was self-evident that they were smaller than standard carry-on hand baggage and we prayed to be allowed to go, but nothing. She didn't change her mind and told us: “size doesn't matter; all luggage must slip down itself in to the drop desk with NO PRESSURE at all! You have to pay a 50€ fine for each baggage if you want to be onboard.” Please note: each hand luggage measure 48 x 30 x 22 cm. (see pictures taken at airport in attachment).
My wife and I got stuck and because the officer verbally abused us I asked for her ID, but she refused turning her name badge over! I asked the other desk colleagues to call the police and they replied:” No sir, call the police with your phone if you wish”.
I promptly called the EU emergency number 112 (I don't know the local police number) requesting police intervention explaining what has happened and that I needed to identify the officers by name or ID. The 112 operators ask me hold on line and after three minutes told me they could not help us; “You could file a complaint against the flight company if you wish.” and let the call drop.