Unlimited text messaging on Verizon?

so i just checked out my usage online and it said that i've gone 98 messages over what i'm allowed, which is 500.

i'm sure that i haven't sent or recieved that many messages and the tally must be wrong, but my question is if i call tomorrow and have unlimited texting added to my line, will i still be charged overage fees for the texts? can i even call in the middle of a billing cycle and have something added to my line?
 
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