Bad Customer Service from Telkom Canal Walk

My husband took a contract at Tellkom(Canal Walk) for freeme20GB deal on the 24th April 2019. On the 7th of May we got an invoice of R13,721.93 where R 11,362.00 was for device obligation which we dont know about. My husband immediately went to the Canal walk store to query the bill. He was assisted by Grant Van Niekerk who is the team leader, and issued him a case number ********** 9 and promised to rectify the bill as he could see it was a mistake that was made by Cindy Haywood when she was loading the contract. On the 11th of May we went back to the store to follow up on the matter and we were told that it has not been fixed and Adrian Lewis promised to escalate the case again. He also promised to give us feedback by the 14th of May. The only sms we got from him was to tell us the issue has not been resolved, he is still trying to resolve it. We have been calling Telkom and everytime we are told the issue will be escalated. Today is the 21st of May and the bill has not been rectified meaning R13.721.93 will be deducted on our account on the 25th of this month. Telkom Canal Walk has worst service , stay away.