Interesting I had the opposite problem - too much info!
Air Asia re-timed one of my flights. I received an SMS text message with the re-timing information - which was welcome info.
Unfortunately, since there are 4 members in my family party, I received 4 identical text messages.
Then they send the same 4 text messages approximately once a week every week for about 2 months! So, I must have had about 30 identical SMS.
At least, I couldn't complain that I hadn't received the info...