Vodafone India — excess bill of vodafone postpaid mob no [protected]

Address:

110030

Resp mam/sir
This is to inform you that i have just change my plan and customer executive told me that i will get 20gb permonth internet data which if i would not use will add in the next month i have not use the internet for last 3 month but used in current month than why my bill come around 744
This is too much normally bill come of rs around 500
Pl correct the bill
Thanks