Telkom Billing is a mess

Billing department of Telkom is hell. I experienced this billing problem with Telkom since January 2019. Several cases were logged telephonic ally and in Telkom stores. I am always told that the case has been escalated. I spoke with agents, team leaders or managers instead of cases being resolved my bill becomes more. I went to Telkom shop in Alberton around October 2018 to change my package from unlimited to Free Me 20 GB that was on special. I was having a Huawei p10 lite device by then that I was having from my unlimited contract that I was going to use to this free me 20GB since it was sim only. I committed to pay for the device on monthly basis until the end of July as my previous contract was not yet ended and that was agreed. Unfortunately I lost the p10 lite on the 19th December 2018 and on the 20 th December 2018 I went to Telkom shop in Vincent Park, East London. I made a sim swap (free me 20GB) I added a device ME 20 Huawei this means that I did not change the package I remained on free me 20GB. January bill was about R2800... I followed up this bill by inquiring. There was R1400 once off device obligation that I didn't know about. Since then my bill will go up to R7800+ and this will lead to backout because the money deducted was not budgeted for and neither expected. Now I'm receiving sms that my bill is R10 000+ because of backouts Telkom charges more than R200. 00 and also bank charges. I am so frustrated. My family is suffering from this and I don't know what further I can do anymore. This also affects my credit score so badly.