I believe you mean "now I have" not "know I have" -- what I am not sure of - do you mean you now have folks who are relatives of your relatives (ie legitimately connected, even tho not in your family) connected and attached to your tree -- or is it a totally bogus connection?
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If the latter, a Curator can help -- if nobody responds here - try ATTENTION Curators, please assist - http://www.geni.com/discussions/80793
if the former, not sure that there is anything you can do about it. But there may be details I am not visualizing - so again, you can try the discussion I mention above.
If you do decide to close your account -- be aware closing your account removes you, not the material you have entered - and if others are now connected to your profile/your tree, they may well become the manager of your tree / profiles you added - so do not rush to close the account.