I want to know what evidences are good enough to prove that a heart operation was unsuccessful?

Question Details:

My father had a heart operation 2 years ago and the doctor did not manage to do the operation right. After consulting other doctors we found out that the operation was not successfully. For example they should place the artery at the point A(and they placed it at point B) , although the report of the operation was pointing that the operation was successfully and the artery is placed on point A. What should I do next?

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