TM30 Notification of the address where the foreigner is staying
TM47 Notification that a foreinger is 90 days inside Thailand.
Two different things with two different computer systems to report, two different things to report depending on change address or the time you spent inside the Kingdom.
Welcome in the club, somehow some people think that discussion is not allowed, advice should be only what they want to hear and Immigration should adjust the law in Thailand on demands on the fist of a few idiots.
It is a shame such people do walk around without a leash and are free to use Social Media.
Take care, they are only though bullies using a keyboard/
As you have to show the tickets and the reasons of multiple visits, you can use the invitation letter for the same periods of time spending in Thailand.