Any account – no matter whether it is active or disabled – that has a rented phone number will incur a monthly fee. This rule applies even if the number is not being used. If the number is not being used, you will not pay usage fees; however, by closing your account, all the numbers associated with that account will be released and the account will be deleted. This action can be taken from the Plivo console.
Accounts that are inactive due to pending verification, or suspended due to detection of fraudulent activity, will incur phone number rental fees.
If you wish to close your Plivo account, you can do so from the console. Please refer to this article for details.