Airtel Prepaid — CUG not created

I am Ashok, I have cug no [protected], and i want to create a group with my friends cug no [protected], [protected], At least 20 days i have been trying to create group. The problem is once i have create a group got the group password but automatically the group is break after 2 or 3 hrs ant i got the sms from customer that u have not created a group successfully pls contact customer care. i am trying to contact customer care atleast 25 times but all said ur grouop has been created in 24 hrs but till to time the above problem is not solve . so pls needful positively. otherwise i have another option is idea gang .