Suspicious activity received via email and text

I had received an  email a week ago stating I had suspicious activity.  I did log into my account and changed my password.  Now a week later I received a text message with the same request except it also asked me to contact them via text to talk to an agent.  Would like to know if there is actual suspicious activity or is someone attempting to get information using Cox.  Please advise.  I do not want to update my password weekly.