As per RBI guidelines, a semi-closed pre-paid instrument, referred as Wallet is considered Inactive if there are no transactions in Wallet for a year. You might have received the alert or your Wallet has been made Inactive because you have not been transacting using the balance available in Freecharge Wallet.
If you have transacted (added money or spent available Wallet Balance) recently using Freecharge Wallet, then this not applicable to you.
If your Wallet has been made Inactive, you need to reactivate your Wallet before you can use it. Please learn more here-http://support.freecharge.in/solution/articles/4000136033-how-to-reactivate-your-freecharge-wallet-