Very Bad Upgrade Service MTN!!!!

Good Day, On Thursday Nov 17 2022 I was called by Mtn to do a telephonic upgrade I was told that the courier company DSV will be in contact with me on Monday 21st November, nobody contacted me, I contacted 083 135 on 24th of November I made 5 calls spoke to different consultants every time... and my calls were ended from their side every time On 28 November I went into the branch at Mfula Mall Piet Retief and was told to phone *** in the store... spoke to consultant and call was ended from their side twice I also called 135 twice and the same happened... the lady at the store said she can not help me... I have to cancel the telephonic upgrade order... then she can help me in store... I cannot cancel because I don't stay on the line long enough !!!!! can someone help me!!!! I have been a customer for over 20 years and have never experienced anything like this!!!