Classification of Workers: Ss-8 Determined I Was an Employee

My question involves independent contractors in the state of: Oklahoma

I filed an SS-8 form last year after working for a company for a few months. The IRS determined I was an employee, which came after I paid close to $3,000 in taxes. My question is, which form do I now send in for a refund? I am not seeming to find the one that fits my situation, although I'm sure it's right in front of me.

Thank you,

April

Classification of Workers: Ss-8 Determined I Was an Employee