src/Ovh/Cloud/CloudClient.php
public function deleteInstance($serviceName, $idInstance){
        if (!$serviceName)
            throw new BadMethodCallException('Missing parameter $serviceName (OVH Cloud Project).');
        if (!$idInstance)
            throw new BadMethodCallException('Missing parameter $idInstance (OVH Cloud Project Instance ID).');
       
       try {
            $r = $this->delete('cloud/project/'.$serviceName.'/instance/'.$idInstance)->send();
        }
        catch (\Exception $e) {
            throw new CloudException($e->getMessage(), $e->getCode(), $e);
        }
        return $r->getBody(true);
    }
public function deleteInstance($serviceName, $idInstance){
        if (!$serviceName)
            throw new BadMethodCallException('Missing parameter $serviceName (OVH Cloud Project).');
        if (!$idInstance)
            throw new BadMethodCallException('Missing parameter $idInstance (OVH Cloud Project Instance ID).');
       
       try {
            $r = $this->delete('cloud/project/'.$serviceName.'/instance/'.$idInstance)->send();
        }
        catch (\Exception $e) {
            throw new CloudException($e->getMessage(), $e->getCode(), $e);
        }
        return $r->getBody(true);
    }
Delete Instances of Project Cloud Public
DELETE /cloud/project/{serviceName}/instance/{instanceId}

@return
@throws \Ovh\Cloud\Exception\CloudException
@throws \Ovh\Common\Exception\BadMethodCallException