MTN is billing my with out a contract

Good day Kindly assist me with MTN, see below

Please note that I did not take a phone and know I’ve been billed for R671.26.

NOTE! Message from MTN Yello! MTN still hasn’t received payment. Avoid legal action by paying R671.26 in-store or via your bank using billing profile BA*** as a reference. You find the details on our invoice.

Another email to MTN complaints department -Enquiry Reference Number *** Dear MTN I’m writing to complain about my Sim Card that’s not working for my upgrade package. PHONE OPPO A74 – *** – *** Firstly, I’m not happy and I’m very disappointed with the service at Maponya Mall MTN see below my story; 1. Sunday I when for an upgrade however the phone was not there I had to go fetch it on Monday. 2. Monday I fetched the phone but the paperwork was not correct and I was told that I should pay R299.00 and R150.00 for the sim card of the contract which I did, I should fetched the phone Tuesday. 3. Tuesday I went however Gontse assisted me saying that Sylvia did a mistake on the application and she need to assist me but she was off. 4. Wednesday I received my phone they advise all is in order however when I came home the Sim card said Rica which I told Sylvia and she said she will fix it in the Monday 5. Thursday Sylvia send me a message saying they busy however I then called her and she made me speak to the Manager, the Manger advise that my sim card will be working in 4hours that will be around 14H00 but nothing was fixed and I never received a call back. 6. Friday I had no call or message from the Manager regarding my sim card, so I cancelled my insurance and I’m take the phone back cause it of no use I have a phone but its not working. Its sad because I really wanted the phone as my birthday gift. I’ve been with MTN for more then 20years and this is so bad. I’m looking forward to your reply regarding this matter. there's not responds from the complaints department

My name is Michelle - ***