In any case where another judge has been assigned under s. 751.03 to hear a particular action or proceeding, the clerk of circuit court shall forthwith notify all parties to the action or proceeding, by mail or telephone, noting in the case file the time notice was sent or given and, if notice is given by telephone, the person with whom he or she spoke. If a written request for a substitution of a new judge is filed with regard to an assigned judge, it shall be filed within 7 days after notice of the assignment has been received. A copy of the written request shall be mailed forthwith to all parties and to the named judge.