Those ads are not from BD. They came from sites that infect your phone with these types of ads (phishing scams). Don’t ever click on them.. Try these steps (for Android phones): Go to ‘Settings,’ then click the ‘Apps’ tab. After that, go to ‘downloaded’ section and then locate ‘Congratulations You Won.’ Select it and uninstall from your Android device. You can also use the ‘Device Administrator’ option on the ‘Security’ in Settings. Before doing this, make sure to uncheck the box of ‘Unknown Sources’ under Settings > Security > Device Administration section. If that doesn’t work try this: go to ‘Settings’ and then select ‘Apps’ tab. In the ‘Downloaded’ section, select ‘Chrome.’ Now click on ‘Force Stop’ tab and then click on ‘Clear Data’ option. Repeat this process for all other browsers like ‘Firefox,’ ‘Internet,’ ‘UC Browser,’ etc. The restart your phone.