There are many ways to get free Robux without verification. One way is to create a new Roblox account. This prevents you from being blocked. Another method is to follow giveaways on YouTube. The owners of these channels usually hold contests wherein they give away free robux.
Robux generators exist online but most of them are illegal. They will redirect you to a different site. You should be aware of these programs before you spend your money. This will keep your Robux from being stolen. It will also be safer to spend your time and effort trying to find a legitimate source.