To stop renewing your current subscription (on www.vi.app, this is known as "Turn Off Auto Renewal"):
If you are using a gmail account:
If you wish to stop subscription immediately and request for a refund, you may head to https://support.google.com/googleplay/answer/2479637?hl=en.
If you're not using a gmail account:
1. Go to https://support.google.com/googleplay/gethelp.
2. Under 'Choose Best Description of Issue', choose 'Others', and select Google Play Apps
3. Skip 'Resources'
4. At transaction ID, go to https://pay.google.com and look for the order you want to return.
5. After you've described your issue, they'll arrange for a representative to talk to you.
Need additional help? Submit a New Support Ticket and our team will get back to you via email.