Data Usage spiked by almost 4x!!!

My normal data usage is 200-300GB per month. However for this month that usage has spiked to more than 1000GB. I called multiple customer support numbers and after finally reaching a human I was told to change my wifi name and password. I have done that but got another message from xfinity warning me I'm set to exceed my data cap. I can't get anyone to help me resolve this issue. I have not added any new devices or changed my usage patterns. Something is wrong with the meter and I need someone to address this issue. 

I've been talking to agents all day - I keep getting transfered before any solution is found. I keep trying to escalate this issue.