Arris G34 Internet Issue

I recently purchased a G34 for my mother, upon installing and working with Xfinity support to activate I noticed many web pages weren’t working unless they resolved to an IPv6 address.  Also ping to an IPv4 address (or hostname that resolves to an IPv4 address) doesn’t work.

I checked the Gateway > Connection > WAN tab and found that the modem is only getting an IPv6 address from Comcast and no IPv4 address (just 0.0.0.0 displayed).  I tried working with 5 different support representatives from Comcast and none of them could resolve, they didn’t even know what an IPv4 address was.  The only next step I was offered was them rolling a truck, I explained that IPv6 is working but IPv4 isn’t and they said we can roll a truck.  None of this makes sense as it’s pretty clear that the modem not being issued an IPv4 address is the root cause here and a technician physically looking at the modem isn’t going to make a difference as this is likely a provisioning issue.

Does anyone know how to get a competent support person at Comcast/Xfinity or what might be required to get this fixed?