Totally useless service

I am very disappointed in Netstar's way of doing business. I signed up the early warning package, and was told that I will be able to receive notifications as soon as something seems to be wrong. After a while, I started getting these SMS messages, "Netstar has received an alarm for vehicle ***. Reply 1 if all is order or 2 for assistance". Which is all good and well, I reply with 1 and all is done. However, it is happening very frequently that I receive the text while driving, for example, and I do not her the message coming in. I then read the message hours after has been sent, but no one from Netstar has tried to contact me regarding the alarm, seeing as I hadn't responded. What is the use of having "early warning" if they do not even consider something might be wrong if a person doesn't respond to the texts? Surely they should follow up? Very irritated and angry.