Renewal of Advisory Disabled Bay

I currently have a have an Advisory Disabled Parking Bay and it's wearing out so I asked the council to renew it but they refuse because I have a dropped kerb outside my garage, which incidentally, is too small to house a car.
My garage is too far to walk to as, obviously, I am disabled and cannot walk too far; approximately 150 feet from my front door. I have appealed against their decision but they say I cannot appeal against their decision.
I have spoken to various charities but no one wants to know or they cannot help. 
I have spoken to the Citizen's Advice Bureaux and they've helped me out a bit but not much because they are limited in what they can do.
My local Councillor has not been very helpful and all she has managed to do is send me email addresses of other council members, I thought it was their duty to represent their constituents.
My property is situated outside a school and people will park anywhere and everywhere and if I go somewhere in my car people are courteous enough to not park on the ADB  or move away when I get there whereas they will refuse to move from my dropped kerb; I know from experience as I have lived at this address for 35 years.
I have told the council that I am willing to pay for the renewal of my parking bay but they still refuse.
I didn't think that a disabled person would have to go through this kind of humiliation and stress and inconvenience as I thought they would be more sympathetic and understanding.