Worst service provider

The worst provider ever, I took a phone on contract in November I was told by a consultant by the name of Lerato at the fourways mall branch that if the phone gives me issues within 7 days I can return it and get a new one. When I got to the store after 4 days of having the phone as it was overheating to return it she told me she didn’t say that. Not only did she lie to me but she told me that I will not be billed that month for the phone as it was faulty and it was taken to be checked. I was billed a week later for a phone that I did not even have. I told her a week later that I want the contract to be canceled as I do not want the phone anymore. She told me that the contract was canceled but I got billed R 16 000 for a phone that I don’t even have. This was later escalated and I was told that this has been resolved and that I will not be billed anything, I got another letter with a billing of R16 000. Today I got a call saying my account is now with debt review as I am owing Telkom 😡😡😡