Should I pay a disputed debt with PlusNet?

I have a dispute with PlusNet over the fact that they claim I haven t paid them for my mobile account, when in fact I paid them by credit card over a week ago. What s worse is they have referred this non-existent debt to a debt collection agency! Should I just ignore any future communication from them about this... show more I have a dispute with PlusNet over the fact that they claim I haven t paid them for my mobile account, when in fact I paid them by credit card over a week ago. What s worse is they have referred this non-existent debt to a debt collection agency! Should I just ignore any future communication from them about this or should I get legal advice? I can definitely prove I have paid them!
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