gosford race 4 layers layed after the jump

i was matched at $7.4 at 7:58pm. i noticed up to $17 or more was matched at the end. The dog started at most 2.80 with corporates and 2.7 at most with the tabs. i was distracted and did not see the start of the race. does any body know how you can ask betfair to audit the betting in this race. the amount involved on my part is not much but it's always a concern when you think punters can get on after the jump on greyhound races.