Netflix actively blocks VPN access to its services. However, the Netflix mandate against VPN usage is not a law, nor does using a VPN violate the Netflix terms of service (TOS). Therefore, using a VPN to access your paid Netflix account is legal.
Netflix customer service says there is no rule against using a VPN to watch their streaming TV shows and movies when asked directly. However, they block people from accessing Netflix streams from outside the coverage area for each region they service due to contractual obligations with content publishers.