Hi,
I'm sorry that you were having issues connecting with us, and for the incorrect price being shown. The screen you are seeing appears to be from the 6.10 version of the app, and I have been advised by our mobile team that updating to the latest version (6.17) should help to resolve the issue.
To update the app:
- Open the Google Play Store app
- Tap the 'Menu' button - the three horizontal lines - in the top left corner
- Tap "My apps & games"
- Tap the "Update" button next to Avast Mobile Security