Vodacom Fibre is a ****

I took out a MONTHLY PLAN fibre with Vodacom (I have quotation of which I have sent to Vodacom countless times!!). I then requested relocation of the WiFi of which they did. My fibre got cancelled BUT now they say I owe them 14k outstanding contract fee!! For which contract because I took a MONTHLY PLAN??? I've been calling Vodacom almost everyday and they keep promising to call back? Keep promising they working on it and nothing. Now they handed over my account for an incorrect debt and it is affecting my credit score badly!!! All the consultants I've called seem to not know and put me through to another department, around and around. I really don't know what to do now to have this resolved!!