Information request on Premium support subscriptions

Hello dear Proxmox community

my organization is interested in moving to Proxmox VE for a part of our actitivities. On the technical side we are enthousiastic about the product capabilities, but we need to know more about the support Proxmox is selling as part of the Premium support before to move on. I did not manage to reach out with Proxmox team directly ( phone + email office@proxmox.com ), so I am asking here. Any clue ?

Thanks in advance
Philippe