Cell C can't even cancel a contact the right way!!! WORST SERVICE IN THE WORLD

I have had very bad network connection since the 1st of August 2019. I have phone them continuously for information. I received no feedback. I decided to cancel the contract on the 12th of August. I was not able to get assistance with my cancelation till the 16th of August. I made it very clear every time I phoned that I want to cancel from the 31st of August 2019. On the 19th of August my contract was cancelled and all my data disappeared. Even the roll over data paid for last month. When I phoned AGAIN for answers I was told the contract is cancelled and I am forfeiting all my benefits. I was not once informed of this on any of the calls I made for the cancelation. Whe. I asked what I will be refunded or credited I was told to wait for the invoice. I cannot even prove that there was stil more than 300GB of data left on my account as even my Cell C app was cleared of info. I ask you how this is fair??? I am more than happy not to be a customer any more with the type of treatment I received. I just want my money back.