Vodafone Idea now VI - Wrong information provided to convert Prepaid to Postpaid for Family plan by VI Marketing team

Wrong information provided to convert Prepaid to Postpaid for Family plan by VI Marketing team :-Received Call from Kothrud VI customer care on *th Dec ****, they informed me there will be ***rs Plan , **GB data, Amazon & Sony OTT Platform Subscription for *year (All these benefits for both no & these are ** days) Then i converted my prepaid to Postpaid but after two days when i got to know everything which was informed to me was not correct. Plan for *st member is ***+Tax & for *nd number its ***+tax, also there will be no **GB for per connection, only **Gb for *st connection & **Gb for *nd connection also its not for ** days its for **days. I logged complaint om **th Dec **** (C***-*************) after this i got call they informed me that there was wrong info provided by Marketing team & i have to go outside to take another card for migrating into Prepaid which may take some **-**hrs. but they told me to wait as i will get some solution from marketing team, but then there was no response from them, i called them again on **th Dec **** & they filed again complaint seems they closed older one without my confirmation (C***-************). Now they are asking me to check for bill which i was not used at all.
I dont want to pay any single rupees as there was wrong information provided by them & also they dont wanted to solve it early. Its almost * weeks still they are not caring about there customers.
Now i want my existing SIM to replaced as Prepaid & I am not going to Pay any Bills, Also they should provide me compensate for this, as i have to continuously follow-up with them like they dont need customers.