I would call the number, press '1' and speak to whoever answers. I've called them many times without issues. Sometimes you go to voicemail because they're busy so I just call again in an hour or so.
They're very poor at responding to emails so calling them is the way to go. They will not give a bonus for a route but they will give you mileage. You just have to say how many miles you want to claim and they'll take it or leave it. They offer incentives on their shops but there is no point in firing off an email to them and asking for a bigger incentive. Just ask for more mileage.
You'll never really know how they feel about your reports unless they send you an email asking for clarification. It's a bit frustrating but it's just the way it is. If you keep getting job requests then I think it's safe to assume they were okay with your reporting.
I do a lot of work for Harland Clarke, they're one of my favorite companies.