Billing Dispute (

Received an invoice in January advising me that I need to pay R13,622.47 iro periods Dec & Jan. My device is for a 1gb wifi/Data and I'm the sole user. I contacted them to dispute their invoice amount. They then provided me with list of requirements which I had to submit. It included my data usage report of the device, an affidavit, signed URL disclaimer form. This was done in application for a thorough investigation which they promised. This transpired 25/01/2016. I followed up weekly iro progress to which I have had no constructive feedback to date. Their credit control dept called me back in mid Fed to advise that the investigation has been concluded and that I'm liable for the R13,622.47 without providing me with any proof. I again, lodge complaint as they've given me nothing as proof e.g IP Address, URL, Itemise bill as requested. They confirmed then that the new investigation/complaint has been registered *** & should be concluded by 5/03/2016. Upon calling them today, they've confirmed that there is no investigation pending and that I'm liable for the bill as Autopage has closed down and all arrear accounts is being handed over to collections after being blacklisted