Oxford English dictionary gives both pronunciations, your teacher is just a dick https://www.oed.com/dictionary/data_n?tab=factsheet#219838686 - it's like my ex who always gave me a hard time for saying "ant" instead of "ahnt."
Atlantis, duh
Songs and artists mentioned in Billy Bragg's book of the same name.
Oxford English dictionary gives both pronunciations, your teacher is just a dick https://www.oed.com/dictionary/data_n?tab=factsheet#219838686 - it's like my ex who always gave me a hard time for saying "ant" instead of "ahnt."