Hi Barbara, sorry to hear you're receiving unwanted Tweets through our service. It appears you've opted in to reach our Milestone Notifications. When you opt in for those notifications we send out a Tweet when your account reaches a certain milestone (e.g. 100 followers). I've disabled this setting for you, so you shouldn't receive them anymore.
If you're still receiving Tweets through our service, could you please send me an email at firstname.lastname@example.org with the links to the offending Tweets so I can check out where they're coming from?