It looks like your pppoe hasn't been set or unable to save.
See there is no line about user name (login name to your ISP).

This is mine, for you to compare:
EX:

pty "/usr/sbin/pppoe -I eth0 -T 80 -m 1452"
noipdefault
defaultroute
hide-password
lcp-echo-interval 60
lcp-echo-failure 3
persist
#demand
connect /bin/true
noauth
mtu 1492
user "xxxxxxxxx@yyyyyy"
usepeerdns

Also check for /etc/ppp/pap-secrets and chap-secrets for matching username and password.