(a) Such employer shall have filed with the department a written protest and petition for a hearing, specifying his objections thereto. Upon receipt of such petition within the fifteen (15) days allowed, the department shall fix the time and place for a hearing and shall notify the petitioner thereof. At any hearing held before the department as herein provided, evidence may be offered to support such determination and assessment or to prove that it is incorrect, and the commission shall have all the power provided in Sections 71-5-137 and 71-5-139. Immediately after such hearing a final decision in the matter shall be made by the commission, and any contributions or deficiencies in contributions found and determined by the commission to be due shall be assessed and paid, together with interest, within fifteen (15) days after notice of such final decision and assessment, and demand for payment thereof by the department shall have been sent to such employer.

(b) The department, in its discretion, determines on the basis of information submitted by the employer that such assessment should be amended and adjusted to reflect the correct amount of taxes.

Sixty (60) days after the due date of the contributions, together with interest and damages, or upon issuance of a warrant, whichever occurs first, the department, in its discretion, may assess an additional sum not exceeding one hundred percent (100%) of the amount of the unpaid contributions due as damages for failure to pay.