Parking ticket by Euro car parks

I have a parking ticket from Euro Car Parks , I wrote received no reply a month later I received a letter stating my fine had gone up to £50 , I informed them I was not driving that day , then I received another letter stating the Highway code. Private car parks are not the same as the highway code and demanded the name of the driver and insurance details , I feel they are out of control and need to have their authority to be removed to give fines as they see fit ,The offence was parking a white separation line for parking , I had told them the passenger was disabled and needed more space for his wheelchair , the disabled bays was full , Then I get another message stating if the fine was not paid it would be taken to a debt collecting agency , My wife went behind my back and paid it , Now I have the hassell of trying to get a refund ,which I doubt will happen . Does anyone know if I can take this company to a small claims court and win my case.
I feel the advise on this sight is against everything that is happening ,
There is no mention of going to court for payment to decide my case , I would prefer to go to court .
My advise is dont let Euro Car Parks Bully , intimidate , harrasse , threaten , abuse, Blackmail , into paying a sum of money to increase their profits which would lead to thousands of £££s
Their signs are not informative and they imply the highway code is the same for a private company , I am so angry at the way I have been treated