You pay for your btoadband a month in advance so if you are in the last month then the contract is fully paid up.
I would therfore assume that the maximum camcellation 'charge' woud be no more than losing the outstanding days on your contract.
Be aware that if you go over the end of your contract, presumably by just one day before leaving, you will be charged the full out of contract price for the whole month. You will then be reimbursed the pro rata rate for the days from when you left to the end of the billing month some weeks in the future after your contract is closed down on their system by Plusnet..
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