Telkom employee reversed into my vehicle on duty

The said Telkom employee, whilst presumably on duty, as he was driving a Telkom vehicle, reversed into my stationary vehicle at Kenilworth Centre, whilst I was waiting directly behind him in a queue entering a parking area. He agreed to pay to replace the numberplate which was damaged, but has since tried to get out of it by first making excuses (such as complaining we took too long to get a quote - which was the quoting company`s timing!) and then promising to get back to us with a form etc. but has not done so. A call to his supervisor to appeal to urge him to take responsibility appears to have been fruitless as that was 2+ weeks ago.