How to stop getting someone's notifications from Twitter?

I have the Iphone 4s. I have the Twitter app, and the other day I let my friend add their account to get on twitter. I then deleted their account. But I keep getting their notifications. I have made sure the account was deleted on my settings, I have deleted the app and reinstalled it numerous times, but I keep getting them. Is their any other way to try and stop it? It's driving me INSANE

Read this:
http://appletoolbox.com/2012/04/ipod-ipad-and-iphone-notifications-what-you-need-to-know/

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