In the enforcement of this chapter, the attorney general may accept an assurance of discontinuance of any act or practice deemed in violation of this chapter, from any person engaging in, or who has engaged in, such act or practice. Any such assurance shall be in writing and be filed with and subject to the approval of the superior court of the county in which the alleged violator resides or has his or her principal place of business, or in Thurston county. Failure to perform the terms of any such assurance shall constitute prima facie proof of a violation of this chapter for the purpose of securing any injunction as provided in RCW 63.14.190 and for the purpose of RCW 63.14.180 hereof: PROVIDED, That after commencement of any action by a prosecuting attorney, as provided herein, the attorney general may not accept an assurance of discontinuance without the consent of the prosecuting attorney.