take (something) further
To advance an action, argument, or complaint to a higher level or more serious degree. To avoid having the ex-employee take the lawsuit any further, the company offered a settlement many believe to be worth several million dollars. I intend to take this matter further with the board of directors if you are unwilling to tender your resignation here and now.
take something ˈfurther
take more serious action about something or speak to somebody at a higher level about it: I am not satisfied with your explanation and I warn you that I intend to take the matter further.