Unacceptable response to billing enquiry

On 1 April 2016, I was notified by sms of a deduction from my bank of almost R18000 by Autopage. On enquiry from the call centre I was told to contact cell c because the business had been sold. <br> I received no statement nor detail of the account.<br> I have never gone over R1800 of use on this account.<br> How funny this ties in with the day they sold the business and they can't provide the detail.<br> The call centre told me to email an enquiry and it will be dealt with in 7 days.<br> I am over R17k out of pocket and need this to be resolved urgently!