The answer is "No." When we say "free VPN," that does not mean you will get free internet access, just that using the VPN itself is free. In order to connect to our VPN, you still need to be connected to the internet to be able to download Betternet and browse the internet.
While the VPN itself is free, and while the VPN itself prevents your ISP from seeing what you do on the Internet, your ISP can still see that you are using the Internet, and the amount of data sent over the Internet.
You can see it kind like wrapping a present. Other people can't see what's in the package, but they can still weigh it to see how much it weighs. A VPN works similarly. The "weight" of your Internet traffic can't be removed, so your ISP can still measure and keep track of your data limits. But they can't see what that data contains.
I recommend reading this section to get more information regarding the functionalities of VPN services: