If you withhold payment that VM believe is owed, they'll put a black mark on your credit file, and ultimately they could add late payment fees, and eventually hand it to a debt collection agency.
So I would recommend you do pay it, but unless VM provide a compelling explanation that you agree with, immediately raise a complaint (search VM complaint policy, do it in writing by donkey post). VM then have two months to resolve the complaint to your total satisfaction, if they haven't then at that time you can escalate the complaint to the arbitration service CISAS - and at that point add a request for compensation for the hassle. All of which is slow, but if it gets to that situation you may derive some satisfaction that VM will have to pay case fees far in excess of the disputed amount.
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Welcome to our Community and thanks so much for your first post - sorry to understand that there has been an issue with your final bill after you have disconnected your account with us.
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