I bought the VPN Service from my computer and it works there but , when I try to using it on my phone It tries to sell it to me again when I already purchased it so I go to the already purchased tab and it won’t let me refresh my VPN . I don’t know if it’s because I’m in a seven day trial. Or it’s just a bug.
It’s because you need to link your subscription from your account to your device:
https://support.brave.com/hc/en-us/articles/13405790544653-How-do-I-add-a-new-device-to-an-existing-VPN-subscription
Follow the instructions for linking desktop sub to another device.