App for securing personal hotspot

Hi there,
So I recently had my personal hotspot somehow hacked - and someone used about 90% of my data allowance. I managed to stop it before things got too far. Im not sure how they managed this as I had a rather complex password.
Is there an app that can act a bit like a firewall or something to stop someone, or more than 1 person, using my hotspot?
I have searched the app store - but its a needle in a hay stack

There are no apps, as none would have access to the necessary API's to do so. Since you can't operate Personal Hotspot without a password, and that password is required for any device to connect, and the screen shows you the number of connections, I'm having a tough time understanding how you were "hacked". You do realize you can terminate connections at will, correct?

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I think you are running into the following issue.
From: http://support.apple.com/kb/TS2756
Note: If you leave the Personal Hotspot screen or put iPhone to sleep, iPhone only broadcasts the Wi-Fi network for an additional 90 seconds. If no devices join the Wi-Fi network during that time, iPhone 4 stops broadcasting your Wi-Fi network. You can start broadcasting your Wi-Fi network again by tapping Settings > Personal Hotspot.
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Z

Make sure software is up to date.
for the personal hotspot setting it is in (settings>general>network>"internet tethering" or "personal hotspot")

App for securing personal hotspot

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