Yup. Get these quite frequently. I have a1TB cap and usually use 500GB by end of month, so I get a few urgent over 50% reminders a day or two before months ended.
Makes a break from the mountains of spam I get. I wish Telstra would give me an easy way of sending them the dozens I get every month. At present you have to mark each one and send it to their spam section. Doesn't seem to make any difference. I still get far too much.
On a brighter note, apparently I'm quite popular with many single Russian girls. What they want with a decrepit old pensioner is beyond me. But it's nice to be appreciated.