Vodafone Idea Limited — 1 number not added in my family red plan

Address:

aundh, Pune, Maharashtra, 411007

We are having 5 Vodafone postpaid connection, we have converted this number in one group plan which is called RED plan with primayr number [protected] but only 4 numbers are added in this plan benefits of this plan is that if 4 numbers are there then we will get 20% discount on total bill and if 5 numbers are added then discount will be 30%. i revert to request to add my 5th number [protected] in this plan at the same time with others but when bill comes to be it was not added. I paid the bill and again request for it and revert to sms for joining in RED plan. but again it was not added in same bill. when i have spoken with customer care executive she has no answer she ask me to visit to Vodafone gallery which was i have already tried again i visited to gallery they ask me to contact customer support. company has all records of my out going message and i also have it.
now my concern add this number on last bill account and apply 30% discount on overall bill.