unlink facebook on instagram! HELP!?

[Hello kitty]

I never shared my facebook on instagram but i keep getting stuff like " Your facebook friend ____ just joined instagram as ______" and they are not even my friend but im sure they are my sisters and they are from my sisters facebook! i also unlinked my sisters facebook from my account but i still get them and one of them followed me! what should i do to not let this happen to me every time and not let anyone of them know my instagram? thanks
i also deleted my other account and made a new one but its still the same

[Pooja]

Delete and reinstall instagram

[Daniel]

on Instagram Go to Edit Profile than Go to Manage Applications Find Facebook Than Click on End Access Or Something Like That If its Not Under There than Try Going Onto Facebook.com Than Look For your App List Find Instagram On it Than Click Remove or it may Say Uninstall Than Instagram Should Be Off your Facebook