Bad service

I bought 2 phones from MTN on contract in August 2022 the Samsung A53 and Hisense U60 the Hisense U60 is not working I took it back to MTN was told they will book it in I'll get a new phone on the 13 October 2022 I called in to find out what's happening they told me it was approved for new phone it will be delivered this week to me today 19 October I call in to find out they now telling they don't have the phone I have been paying for the phone I haven't used for 2 months and MTN is giving me stories am very hurt and upset my contact number is *** my ID number is *** K. Kitsa