I use this kind of method by changing in Google Chrome >Security and Privacy, and changing it to 1.1.1.1 (cloudflare) I can access casino to any without using a VPN and this I have been using for a long time after the ban from the government.
Maybe you can try with this here the thread:
https://bitcointalksearch.org/topic/m.59316982A simple no VPN way for restricted casino access.
This doesn't mean you're did right and there's no problem for your account, even though you're not using VPN, but this trick is masking your IP address since you're changing the server.
The best way if you get restricted due to your local internet provider is contacting the representative to look the best solution, you may be asked to provide KYC to prove you're legitimate come from the unrestricted country. Since Duelbits is a trustworthy casino, so there's no problem to give KYC to them.
Here's the full list of the banned and restricted countries:
Banned and Restricted Regions
Banned Regions
People living or having a permanent or temporary residence in any of these countries are not entitled to register an Account onduelbits.com or use any of the Service on duelbits.com.
Aruba, Austria, Bonaire, Curaçao, France, Netherlands, Australia, UK, Spain, Saba, Statia, St Martin, USA, or any other jurisdiction that the Central Government of Curaçao (formerly the Netherlands Antilles) deems online gambling illegal or are blacklisted.
Residents from the aforementioned territories are prohibited from opening an Account or in any way use or access the Gaming Services or any other Services offered by the Company.
Netent Restricted Regions
A. Blacklisted Territories
Afghanistan; Albania; Algeria; Angola; Australia; Cambodia; Ecuador; Guyana; Hong Kong; Indonesia; Iran; Iraq; Israel; Kuwait; Lao; Myanmar; Namibia; Nicaragua; North Korea; Pakistan; Panama; Papua New Guinea; Philippines; Singapore; South Korea; Sudan; Syria; Taiwan; Uganda; Yemen; Zimbabwe.
B. Regulated Territories
Only permitted if receipt of a license from local regulator has been seen and approved by NetEnt
Belgium, Bulgaria, Czech Republic, Denmark, Estonia, France, Italy, Latvia, Lithuania, Mexico, Portugal, Romania, Serbia, Spain, Sweden, Switzerland, United States of America, United Kingdom.
https://duelbits.com/tos