Purtroppo ha ragione il tuo rivenditore.
Per i Service Provider la licenza è diversa.
https://partner.microsoft.com/download/global/40190603
Here are some examples:
You have a 2-processor server with 4 VMs. You will need eightlicenses for 4 VMs on a 2-processor server.
You have a 2-processor server with 6 VMs. You will needtwelve licenses for 6 VMs on a 2-processor server.
Ti convengono le Datacenter.
Ciao