Verizon Wireless Data utilization being counted wrong. Nationwide

I'm having the same issue that others have reported with Verizon and how they count data.  I had Verizon in prior to 2013 and data usage was not be a problem then.  I left Verizon in May 2013 to go to T-Mobile.  The coverage was horrible with T-Mobile so we came back to Verizon in July 2015.  Since we have been back with Verizon, we have had to pay overage charges for data each month. 

My most receent problem.....I used 1.5 GB of data the last billing period.  I have set my data limit at 1.5GB for my phone.  My new billing period started Oct. 24.  Today is Oct 26, I got a message from Verizon at 3:08pm saying I have used 50% of my data already....in 2 1/2 days!!!  I've been sitting here at work where I'm connected to my work wifi.  I disconnected the wifi for about 20 minutes today around 2:30pm  and then I reconnected the work wifi.  At 3:15pm, I got another message from Verizon saying that I have now used 75% of my data and that I am now at 1.125 data used for this new billing period.  What the heck is going on? How did I use 1.5GB all of last billing period and in 2 1/2 days I have used 1.125GB of data.  I don't stream music or watch movies. I don't have many apps.  I may occasionally watch a 2 or 3 minute FB video but I haven't even done that today.

I contacted Verizon and they say they will investigate to find out what caused the sudden increase with the data usage.

If anyone knows of any class action lawsuits pertaining to this issue, please let me know.