Got my hair done today and the high lights are brassy?

hello im a natural dark blonde today i went to rush and spent 120 on a full head of highlights only to come home and not really see nay difereance in my hair except from some really b rassy tones which make my hair look darker and then theres is :( the hairdresser said she really liked i what should i do just save up and wait till next month and do them again ?