Stop sending me text messages reminding me to update the app. I consider this a violation of my privacy and a misuse of your access to my phone. I can't even blacklist you. That option is not available for your messages. I paid for the app, I'll update it if and when I want to. Stop the spam or refund my money and I'll delete the app. By the way, the messages are arriving just after midnight, local time. Most people are asleep at that time.