I hear all the input, and am grateful to all of you for your thoughtful responses. This spike is nearby a terabyte of data. NO ONE uses that much in a 24hr period. Also, we have not changed anything. If stuff is playing in the background, or updating, or downloading, or browsing, etc, etc.... there should be a higher data usage all the time. There isn't. We have consistently stayed well below the amount I pay for every month. This is an incredibly abnormal spike. Something is wrong. The responses from 'support' are comical and even offensive...one of them talked to me about changing my lifestyle. I'll try again to talk to someone, tomorrow.