An Azure service that provides defense against distributed denial-of-service (DDoS) attacks.
Kindly check your invoice and confirm when your subscription was disabled. Also, check whether the charges are calculated only up to the date the subscription was disabled or if they are still being calculated after the subscription was disabled.
Even if charges are still being applied after the subscription is disabled, open a support request by navigating to the Subscription Overview ,You can follow the MS DOC for more details
If your subscription is disabled, you won't be able to deactivate or delete the DDoS protection plan. Please reactivate your subscription by following the Msdoc, and then proceed to remove the DDoS protection plan associated with the virtual network using the below script.
$vnet = Get-AzVirtualNetwork -Name <Vnet-Name>-ResourceGroupName <RG-Name>
$vnet.DdosProtectionPlan = $null
$vnet.EnableDdosProtection = $false
$vnet | Set-AzVirtualNetwork
Reference: Remove a DDoS protection plan associated with a virtual network
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