rootdn "cn=Manager,dc=example,dc=com"
rootpw secret
Just making sure I understand. Your slapd.conf states that the ldap admin is#ldapadd -x -D "cn=Manager,dc=xyzcompany,dc=com" -W -f /etc/openldap/xyzcompany.com.ldif
cn=Manager,dc=example,dc=com
However, when you are importing the ldif file you are stating that the ldap admin is
cn=Manager,dc=xyzcompany,dc=com
You need to use the same admin during the import that you have set up in the slapd.conf file.
If that does not solve the issue, do the following:
First, search your machine to make sure that only one slapd.conf exists.
cd /
find -name slapd.conf
Secondly, post your slapd.conf file so I can have a look at the entire file. I think that you are overlooking something.