What should my wife do to officially cancel her Non-O visa after conflicting advice from immigration offices in Thailand?

I used to be a volunteer for a foundation in Chonburi province (actual volunteer with documents and work permit). My wife was on a follower non-O visa. I cancelled my visa and work permit before leaving at sri racha immigration and we were advised to just have my wife leave through the airport to cancel hers. We both flew out to Indonesia and are back now on tourist exemptions. We went extend in Chiang mai and were told they could not extend hers because she did not cancel her old non-o at the same time in the same immigration office. Though they said the computer showed that both our old non-o visa are cancelled. They said we would have to fly to chonburi and get them to “officially” cancel hers with the stamps. Sri racha officials say they don’t know what Chiang mai immigration is wanting. Any advice? We are both American.