I don't know if live chat support can answer (as long as it's not officially listed in Terms and Conditions) on whether or not you can use a VPN. However, here on Bitcointalk I saw people representing casinos officially wrote that it is possible to use a VPN in their casinos. I have seen this situation several times.
They can answer it as there's already a prepared response for it. Copy-paste indeed as what it supposed to be.
The response will be the same and that's because of
"restriction on the region".