Can't provision any compute instance in GCP nor increase NCPU quota – Debian

Since many days I can’t provision any compute engine instance in my google cloud business account.

Billing is enabled on the project, I can’t tell what’s wrong from my side.

I sent a first request to the support before yesterday, yesterday, and today again, and here is a screenshot of their answer.

I’m lost, I don’t understand why they ask to check with their sales team.

Here my terraform output error :

google_compute_instance.lykanda-backend: Creating…
google_compute_instance.lykanda-backend: Still creating… [10s elapsed] Error: Error waiting for instance to create: Quota ‘N2_CPUS’ exceeded. Limit: 0.0 in region europe-west3.
on compute.tf line 88, in resource “google_compute_instance” “lykanda-backend”:
88: resource “google_compute_instance” “lykanda-backend” {

My compute instance block code :

resource "google_compute_instance" "lykanda-backend" {
 project = "869410787656"
 zone     = "europe-west3-a"
 name     = "lykanda-backend"
 machine_type = "n2-standard-2"
 boot_disk {
  initialize_params {
   image = "debian-cloud/debian-9"
  }
 }
 network_interface {
  network = google_compute_network.lykanda.self_link
  subnetwork = google_compute_subnetwork.lykanda-network.self_link
  access_config {
   nat_ip = google_compute_address.lykanda-static-ip-address.address
  }
 }
 # metadata = {
 #  ssh-keys = join("n", [for user, key in var.ssh_keys : "${user}:${key}"])
 # }
 service_account {
  scopes = ["userinfo-email", "compute-ro", "storage-ro"]
 }
 allow_stopping_for_update = true
}