Sudden and Unusual Internet Data Spike

Within the past week I’ve seen a sudden and very unusual spike in my data usage like amounts within hours I should never be able to do on my own.  And it is clearly abnormal from my past months. I’m looking at some huge charges because literally It is telling me I’ve used my whole months allotment within the first day of the month. I received the 75,90, 100% useage emails literally within minutes of each other. Xfinity has said they won’t send a tech out to look at my apartment building which has the internet cables currently exposed in several places and even a cable splitter at one of the locations, even the apartment manager said xfinity should come look when I emailed them about this issue. All xfinity does is they keep is trying to upsell me to a new package which I don’t need. And they won’t investigate into my case any further because at this moment there is not a spike and yet that doesn’t help me because my internet is still over and I’ll only continue to go up.

I’ve tried everything on my side, factory reset my router, changed passwords, looked at connected devices and yet I still had my usage going through the roof. The call today I received said I would most likely be charged this time around for the overages when the first ones that were waived were from this same problem. I can’t afford this