Tea is right or teea

The word tea and tea are both true and neither is false. But what is important is that the word tea is formally correct in literature, but in colloquial literature and most people say tea.
This drink is called “Cha” in China. After entering Iran, a letter “Y” was added to it and it was called Chai, and gradually it was referred to as “Chai”.
It is less important what we say in colloquial terms, but it may be better to use the word tea in official texts.
After water tea is the most popular drink among Iranians and has many properties, so its consumption can be very useful for the body.