A 17-year-old from Ulladulla and an 18-year-old from Sussex Inlet both pleaded guilty to robbery in company, stemming from an incident at Kings Point on August 25 last year in which a man was punched and his phone taken.

Court papers said the man, who lives near the Kings Point Water Ski Park, was investigating erratic driving in the area around 9.30pm.

Police said he filmed a number of vehicles in the area on his mobile phone, when the three teenagers, who were in one of the cars, took exception to being filmed and after leaving the location returned to get the mobile phone and destroy the footage.

The court heard they turned up at the man's house and revved the engine loudly and when the man went to investigate he was confronted by the trio who knocked him to the ground.

He was kicked while on the ground, sustaining a head wound.

A neighbour came to the man's aid and called police. He was taken to Milton Hospital for treatment.

It was discovered his mobile phone was missing.

Police investigations led them to the trio.

In Nowra Children’s Court, Magistrate David Williams placed the 17-year-old on nine months’ probation, while the 18-year-old was placed on a nine-month good behaviour bond.

Both were also ordered to pay compensation of $135 to the victim.

Another 18-year-old from Sussex Inlet, who also pleaded guilty to robbery in company, had been previously placed on a nine-month good behaviour bond.