The extra data will show up AFTER the first auto payment, not on the date you enroll.
I have already paid my first auto pay payment but no additional data given.
If you have made an auto-payment, then you will see the extra data the next month. If you have made 2 auto-payments and do not see the extra data, you should call Verizon or use Live Chat to have the data added. Basically, you make a payment to start service, then add auto-pay info, then, the next month auto-pay makes the payment, then the next month the data is there. Some folks have luck contacting Verizon after the first month and after adding auto-pay info so that the second month shows the added data.