Airtel — for postpaid plan

Address:

Vadodara, Gujarat, 390010

I was tata docomo user. recently I have Port my no. to Air tel on 13/12/2018.At the time of submission of documents, i ask for CUG plan. desk operator inform me about CUG plan. I was agree for my three air tel no.of my family members. but when i went to home, I came to know that my family members are using JIO sim. so next day I went to same store and inform to same person not to go for CUG plan. I told to help desk operator for Rs 245/00 Postpaid plan as i am TATA docomo user..yesterday 05/12/2018, I got massage from air tel that my postpaid bill generated for Rs.597.00. As my family members are not covered in CUG, they are using same prepaid air tel no., why i I have to pay this amount?why company not billing for Rs.245.00 plan?