No response from Team Leaders or Call Centre

Call logged with Vodacom Call centre on the 10th March 20 16 about data being used and bill increasing daily without being used by me. Requested for account to be locked on 11th March 2016. Even though account is locked the bill was still increasing. Vodacom said account will be investigated and feedback will be given in 14 days. Each time I call there's no progress, investigation is pending. Promises made that I will be called back but it never happened. Vodacom said that no debit order will go off but it did on the 29th March 2016. Today I get a bill to pay in the thousands. No one has called me back including the Supervisor / Team Leader, to resolve the issue. My account is still locked and they expect me to pay for something I haven't used or still cannot use. Please show common courtesy and resolve the issue in a dignified manner.