Unrealistic low quote at Outsurance approved suppl

The incident was reported to Outsurance in March 2015 whereupon I was instructed to have the vehicle assessed by an Outsurance approved panel beater. As I deemed the quote to be too low I proceeded to 3 reputable Companies in this field. The average price by these panel beaters was approx.. 4 times higher than the original quote. (Confirming my suspicion of the low quote?) \\Armed\with these quotes I attempted to negotiate a higher value from Outsurance\""