Do I need to update my address with immigration after purchasing a condo in Nong Khai while on a retirement visa?

Hi .im living in udon,i have retirement visa up to november 2019.im staying in rented accomadation.my contract expires november 2019.so thats ok.i have just bought a condo in nong khai.when i asked in immigration in nong khai.whether i had to change address.i was given a paper to keep in my passport.that says i am now registered and that can carry on living in udon , because my address is there.now i have just been told that once i have my house book in my hand i have to change address to nong khai.i hope someone understands what im talking about and can help to advise.im gettjng too many dufferent versions from immigration offices.thanks for trying.