Telkom device fee

I app**** for a cellphone contract online on 28 January 2020 and it was delivered on 30 January 2020. Before delivery I tried to cancel the application but i kept on being referred to from one agent to another. Long story short, i couldnt cancel it and it was delivered on 30 January 2020.

Now i receive an invoice that i have to pay a device fee of R649 for a phone I used for only one day. This is paying a monthly fee for a phone that was used only for a day. I called the sales department and was told there is no pro rata on the device fee.

This is the most unfair condition that you have and would you have advised me I would have ordered the phone after the 1st of the new month so that I pay for something that I actually used.