Here are some related discussions on Mesechtes Megillah 24 that I found online on a daf yomi sources prepared by Rabbi P. Feldman
of Kollel Iyun Hadaf, Yerushalayim:
Once again, you’ve answered the question that no one asked.
No one disputes the importance of pronouncing words correctly during davening. You weren’t asked to produce sources to that point… I could have done that too.
You were asked to produce a source that shows that when a person mispronounces a word, “a deformed malach is created that will testify against him in Beis Din shel Mala.”
Please provide the source to that or retract.
Thanks,
The Wolf