You may be recieving the messages because of someone else who has used your account. In using your account they may have placed complaints in your absence. Xbox live, for instance, gives the customers and users the options of filing various types of complaints. All of which are a form of violations. Violations such as harrassment, tampering and verbal communication related problems and the list goes on.
You may do well to find out if anyone within your home has used your account to file such a report. it is rather simple to file, as well. One needs only to select the gamer tag (the online name of the suspect) and to select the words "file complaint". Once selected, one can choose from multiple complaint options (violations).