Hi there,
What advance charges are these? If you are signing up as a completely new customer and not migrating in from another supplier there is an activation fee. However you don't have to pay this up front, this can be deferred for 12 months, meaning that if you decide to stay for the full 12 months you wouldn't pay this charge.
If you want to let me know the username you signed up with I can check this for you.
Kind regards, Chris Parr
PlusNet Comms Team