MTN is the worst service providers I have come across

I have opened a new contract with MTN . Got myself an Iphone 13 . I received the phone on the 15/11/2022 . The phone froze 3 times in a space of 2 weeks . I returned the phone to the store on the 29/11/2022. The gentlemen assisting me at the store said that he would need to book the phone in for warranty inspection and once they inspect the phone MTN would issue me with a new phone . The phone was rejected and returned to the store as the phone was locked . I only received this feedback on the 12/01/2023 a month an a half later . I went into the store and unlocked the phone on the 16/01/2023 and asked for the phone to go back in for inspection . I emailed the gentlemen at the MTN store on 26/01/2023 to ask for an update Got a reply on the 27/01/2023 saying that there has been no feedback yet.I am still waiting until today 30/01/2023 with no feedback . I have been 2months without a phone now and yet I am paying for the contract but have no phone . Can someone urgently look into this matter sort out my issue and give me a new phone As soon as possible or I will be cancelling my contract at MTN.