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you should really contact Verizon, perhaps they think that since your phone its the main line and the other phones used up the data it shows as you using all the data.
Settings > data usage
Mobile data traffic
Set mobile data limit
there should be a date here, change the date to the previous cycle and report back
go back on 2 or 3 cycles
That's quite odd, unless, have you factory reset your phone? or updated to lollipop recently? open google plus (app) > menu > settings > auto backup > is it on?
This is really odd, but you are not alone, check this out
it seems that verizon has done this before.