If you agreed at the lower rate it is highly unlikely they will give you more now so I wouldn't waste yours or the scheduler's time in asking. If you have not received the materials the standard would be to extend the due date. Now if an extension interferes with your schedule it would justify asking for a bump in pay. Did they ever send an email stating when the materials would be delivered or providing a tracking number? If not, try calling them.
Equal rights for others does not mean fewer rights for you. It's not pie.
"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag." -Molly Ivins
Never try to teach a pig to sing. It's a waste of your time and it really annoys the pig.