Pathetic Fu!king Service

I was contacted by a MTN representative on 30/09/22 who assisted me with upgrading my contract number ending in 2523. I contacted the MTN business call centre on 03/10/22 as I no longer wanted the upgrade. I was advised that it will be cancelled. I have now received an invoice billing me for the upgrade and device which I have not received as yet. I have contacted the call centre numerous times querying the matter and have not been provided any relevant information. I am no being billed for a contract that I was advised will be cancelled and a phone i am yet to receive. UPDATE. To date I have not received the phone which I have been billed twice for and the contract remains active. Does MTN assist its customers?