Canada: home siding and roof claim

So my home here in Canada got hit by hail a couple of weeks ago. The insurance company told us to get someone to do the work and they send a check for 15k, a contractor we are looking at said that they would talk to the insurance company to get them to paid out more to fix everything that was damaged by the hail (siding, shingles, gutters, window trim, garage door, etc). How true is that? Because the insurance company gave us the budget of 15k after a contractor from them came to inspect the house. I just don't want to waste money and time if the insurance company doesn't agree to pay more.