Cancelled Contract, yet charged for full month.

Rain, I have requested cancellation of my Rain subscription on 8 July 2020 (ticket ***), again on 10 July (ticket ***) and 22 July (ticket ***. Because of no internet. Then I cancelled my SIM card. From your offices Thumba Mthombeni wrote: "The cancellation will take place on the last day of the month, but you will only have to pay for the data you've used." Yet you charge me the full amount on 1 Aug. Pro-rata to 8 July as you barely provided any internet.