I won’t pay for something I don’t have

I visited an MTN store in February 2026 at Southgate mall , the guy’s name is Honours who was assisting to enquire on a contract I had app**** for telephonically, I got numbers for one of the consultants(Honours)who was willing to help me as there seems to be hold for my application, my application has been app. He cancelled the online application and redid an in store one. The guy finales the contract and I have my mind as MTN was taking their own time with the availability and no show delivery . I recently asked Honours to cancel my contract and this is the message I received from him “Apologies I was way too busy yesterday, unfortunately the phone has been invoiced and your first invoice has been generated so it's too late for cancelation. To cancel now you'll be charged cancelation fee” How am I invoiced for something I don’t have , I never opened not received the package and I don’t want it anymore.