unfortunately, you can't charge a penalty for breach of Bylaws or House Rules unless there is a provision for being able to institute such charges already included in your Bylaws. If not, that then requires a proposed Bylaws change, writing it up with infractions/charges delineated and specified in some manner, and it being passed by a 2/3 majority at a special meeting called for that purpose and announced and specified in advance according to the requirements for such as stipulated in your Bylaws. You should start a paper trail of letters and demands, make sure it is in your house rules or put it there (keeping doors closed), and at some point decide how you want to enforce it. Do not threaten unless you plan to actually act or you will create problems for yourselves.