Data usage dramatically increased

On April 16th I was sent a notification of using 90% of my 1.2TB Data Plan. I found this odd because the house averages around 600GB of internet usage for the whole month. From OCT 2021 and Each month after the data usage has gradually went up. The internet usage of the Family has not changed. I've looked at my past notifications an have never received a Data Usage alert. I have since removed myself off the Family network for internet, except for now. Only two or three Devices are are connected to the internet, but today only 6 days after receiving the notification, we have used 450GB over the 1.2TB. Come on something is going on.  Is the Data Packets becoming larger? I do believe this 1.2TB plan we've had for 10+ years. The data plan should match the average users monthly usage. After searching the community, I looks as if several Xfinitity members after been experiencing the Same Issue. Anyways, is there a tool available to assist in monitoring the traffic and data used from the modem? I know there has NOT been 1.2TB of data going across the router this month. I'll be extremely monitoring and capturing the internet traffic at the start of May. The Wife is not going to happy. ;)