Unfair Charges

Purchased x2 contract on the 28 Aug 2018- I was informed about Pro-rata charges and that it would be added to the end of the next months billing. Under no circumstances was did they inform me that the pro-rata billing does not extend to the fee for the devices. I have had the devices for 4days and was charged R699 & R119 for an entire month of AUG . How is this fair ? I didn't even have the devices for the whole month. The mobile call center is telling me to dispute the query in store, basically this isn't their problem. Not only is the charges unfair , they cannot assist me at all. I have multiple contracts with this provider and this is the level of service received.

I refuse to pay this a total of R818 for owning a device for 4days. If this was explained in detail as they are supposed to do, then I would have waited the 4 damn days and bought the devices in the new month.