Welcome to the forum.
Please keep in mind that what you received was a payment, not a paycheck. These companies do not have the same obligations as an employer might have. They are settling a contractual obligation with you, an independent contractor.
That being said, follow the advice already given and contact them.
My posts are solely based on my opinions and for my entertainment, contact a professional if you need real advice.
When you get in debt you become a slave. - Andrew Jackson