Recently active topics in Twitter tagged with system

My phone is getting system messages from Twitter every 60 seconds. I tried following "twitter_status" and began getting a message every minute that said "You are now following twitter_status..." I got frustrated after receiving 30+ notifications so I turned off mobile notifications. This didn't help, so I went on the website and deleted my device. Now the "you are now following" messages stopped, but I'm getting "Hi! Please confirm by replying with your name" over and over instead. I even replied with STOP and it won't stop.

If I didn't have unlimited messaging I'd be extremely pissed right now.

I have SMS for Twitter, yet I don't subscribe to or receive any tweets from my network. i also rarely update via mobile (maybe 2% of the time)

However, I've had the following message at the top of my web portal for about 2 weeks now, which is really perplexing!

"SMS Alert: You've received the maximum SMS updates for the week. You'll get 250 more in 2 days. Remember, you can always read all your updates via the web! Find out more."

I use the web portal almost exclusively, so why do I have this warning?
Thanks!