I'm an independent contractor, a company who said they'd pay me $45 only paid me $10. How can I get the rest?

She won't reply to my e-mails, phone calls or anything. I drove over 3 hours and 128 miles for a lousy ten bucks. If anyone wants to try for fun and send her an e-mail, her name is Michelle Lee at Sprint Mortgage Services. Her e-mail address is: smsi@aol.com. Please just simply ask her if she would be an honest business woman and pay Cara Johnson the $35 she owes me. Thanks everybody!