Vodafone India — plan upgrade without my consent

Address:

Ghaziabad, Uttar Pradesh, 201012

Vodafone cx since 2007. My voda #[protected]Lifetime postpaid-0 rental plan) has been upgraded to red basic inr 299 without my consent. No call, no msg, no email from voda regarding plan change. Wrote 2 emails to "vodafonecare. [protected]@vodafoneidea.com" but no response. On top of that, there is no voda network in my locality. Why should i go for 299 plan, when i can't use the network.
Now that i have not paid the bills, they are sending me emails again and again.
For a bill payment, they can send emails, but for plan upgrade, they can't send an email. And they also know that there is a network problem.
I called cx service twice. They did not do anything.
What i want is, the old bill as per my old plan, waive off the new bill and i will convert it to prepaid.