Today I reached the office late.
My boss asked: "why you are late?"
I said: “My car had been breakdown near circle."
Then boss asked: "Then how you reached office"
I said: “I called the mechanic. He repaired the car. After repairing done I took the car and come to office"
I want to tell him my car had breakdown at 8:00 am and till 10:00am I had that problem till car was attained by mechanic my problem solved and reached home.
Should I use "had been" or is just "was" okay in my first answer? Is the above conversation correct? Specially my first answer. If not then how should this conversation be?