If they paid you with a 1099-MISC, they are treating you as if you are self-employed. This means that you will be liable for paying both the employer and employee portions of FICA tax (Social Security) and your income taxes.
If you are an employee, you can file a complaint. Please use the link below to determine if you should be treated as an employee and if so, the steps to file a complaint.
https://www.irs.gov/businesses/small-businesses-self-employed/independent-contractor-self-employed-o...