places like the ticket machines in parking lots, usually have video cameras, incase someone avoids the toll, or ram-raids thru the gate.

u can approach the company etc, and ask 4 the footage. but u will probably have to either, file a police report and get the cops to take a look at the footage.
or b. take it to court, and Subpoena <- (not how its spelt but u know what i mean) the footage from the company.

best thing is go to legal aid, they'll give u advice, and if u can apply 4 legal aid first then put in application 4 court procedings, that way legal aid will fund the application fee.

the police may b motivated to do something if u mention the cameras, that way they may b able to prosecute the person. if not get legal aid and take it to court, with 3 quotes 4 the damage and a look to possibly subpeona the video footage.

the other person has probably changed their mind cos they think=they can get away cos of lack of witnesses/ evidence. once u mention that u have or r going to get the video footage, they'll change their tune.