GST obligation as a Direct Contract employee

I signed a contract with a company as an individual direct contract employee with fixed pay monthly. TDS is deducted on my monthly payments. The total amount will be around 40+LPA.

I also have a GST as a proprietor. My CA has asked me to charge GST as amount will cross the 20 Lakhs threshold. The company says it is not required as I am an individual and on fixed pay contract. Who is right?