awk -F'"' -v OFS='' '{ for (i=2; i<=NF; i+=2)
                           if ($i == 12 || $i == 17)
                             print substr($i,index($0,$9))
                           else  gsub(",", "", $i)
} 1' $1 > testTREATED.csv

ID,ID_CUSTOMER,CUSTOMER_FULLNAME,TYPE_DOCUMENT,NUM_DOCUMENT,CUSTOMER_NAME,LASTNAME1_CUSTOMER,LASTNAME2_CUSTOMER,F_UID,L_UID,ID_LIST,ID_ACCOUNT,DATE_OF_BIRTH,CASE,ANALIST,COMMENTS,COMMENTS2,START_DATE,ORGUNIT_ID,AMOUNT,TYPE
0001,,SWISS CHOCOLATE LTD,,,,SWISS CHOCOLATE LTD,,,000000-000000,XX,,,,,,,"25/06/2007 23:45:65, 000000000",0,,

25/06/2007