Vodacom bad service

So I did early cancellations on my 2 contracts.I received the settlement letters for both and made the payments.My contracts were cancelled no problems. I now wanted to get a new contract for home wifi because Im staying in small town with bad signals and no fibre.They then told me they cannot help me because I ow them money. And cannot even log into my account to see statements because my contracts is cancelled.Explain that to me???