High data usage

I have recieved texts/emails that I have used over 1229 G of data. It's only the 7th day in February, who is this possible? Nothing has changed with my usage. No additional users, no 4k streaming, no gaming. Nothing. I have NEVER gone over my usage in the past few years and no all of a sudden I've used it all in 7 days? Something is wrong. I have restarted my Modem, didn't change anything. How is this happening all of a sudden with no change in my equipment or usage? I've contacted customer service and they told me to wait, until the month is over. But if I do that, I will double or triple my usage! If this does not get fixed will have to change carriers.