Unacceptable charge.

Good day. I opened a contract on 15 July 2021 at the Menlyn branch and went to the store to cancel it on 16 July 2021 (less than 24 hours after taking the contract) due to connectivity issues. On 20 July 2021 I received an sms stating that the contract is cancelled, yet the store has since said it's in process. Last night I received a statement stating that I need to pay R445. This makes absolutely no sense to me and I ask that you please assist in this regard. I do not see how I am liable to paying for a contract I did not use and cancelled. If anything, I was expecting to be reimbursed of my R150 sim connection fee because I brought it back the very next day and thus didn't make use of the service. Please help.