Oracle may take 27 as a month, and this generates such an error
Try to specify the format in the control file itself
load data
infile 'file1.csv'
append
into table my_table
fields terminated by ',' TRAILING NULLCOLS
(Business_function,
Case_reference,
Sub_sequence,
Dialler_Master_Stream ,
Dialler_Call_Stream,
Dialler_Super_Stream,
Attempt_Number,
Dialled_Number,
Date_Called DATE "DD-MM-YYYY")
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