What VPN software / hardware do you use for your office?
We were previously using just a plain Ubuntu server with ppp, ipsec, and strongswan. It worked well, but I couldn't get RADIUS authentication working with it so I had to manually add / remove accounts and staff didn't have the ability to update the password if needed.
I then found another solutions, Pritunl, that is what we're currently using. Only issue we've had is that certain ports aren't routing through the VPN for some reason and their support isn't the best.
We use a mixture, L2TP for general staff, IPsec for Finance and SSLVPN for IT. Our end users are mostly Mac and found IPsec not reliable to configure and L2TP pushes out using our MDM nicely.
Our finance team are Windows based so we use IPsec. Multiple VPN's isn't ideal but it works so it is what it is.