Double bill when upgrading

I upgraded my contract with Telkom on the 26.06.18. ( ********** 297)

The telesales agent Semone Paulsen, did a fantastic job getting the device to me on the 27.07.18. She also informed me that I will be charged pro-rata at the end of July, to which I accepted.

My bill now shows that I have been charged for an entire month for device i.e. 01.06.18 - 30.06.18.

Please fix.