False advertising and incorrect billing

I received a 5G device which was not properly activated .I ordered on the 24 of July and I logged a ticket with the following reference number: ***, for the device not working. I was then told the system does not see the sim-card attached to a customer and therefore I will not get any service from it. I now receive billing saying I owe them R47 and that my service has been suspended. How do I owe you when you said " order now and only pay end of August"? I am now compelled to pay for a service that was never rendered to me in the first place. I have asked them to collect the device and reverse whatever they think i owe them.