yeeees , i mean that

in the formal leter you can't use it , only for slang
in formal >> مباشرة تحذف كلمة the

the important is you are understood

i was feeling there mistake , thank you for correct
yeah sure i'm understand what you're trying to say

here also :

i was feeling there mistake , thank you for correct

correct answer is

i felt there is a mistake , thank you for correct

be careful next time