Didn't pay the bill sounds vernacular

Student or Learner
Hello!
Which is better here, the past simple or the past perfect?
"When I arrived, my father told me he was angry because the chemist said he didn't pay the bill/he hadn't paid the bill".
Thanks a lot for your help.
Will
Didn't pay the bill sounds vernacular
Welcome to the forum, Jagrati.
Please read the Posting Guidelines – especially this bit:
You are welcome to answer questions posted in the Ask a Teacher forum as long as your suggestions, help, and advice reflect a good understanding of the English language. If you are not a teacher, you will need to state that clearly at the top of your post.
Rover
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