You can refer to it any way you want. When speaking in English 98% of Turks that I know still call it Turkey (It has always been Turkiye in Turkish obviously). It is sort of like if you go to MUMBAI, almost everyone calls it Bombay. It should be noted that in most other languages the name has not changed and it is still Turquia, Turkei, Turchia, etc both before and after the "change". Also how few people really use Czechia.