24 year client's product given away

On the 26/2/15 I was due for yet another upgrade in my 24 year span of being a client of not only MTN but also Supercall Cellular being bought by Autopage. I'm on a talk 750 and chose the IPhone 6Plus. I was told there was no stock but it will be in the next week. 3 weeks later I went in after not being contacted, no stock, 2 weeks later I was phoned with the news they had it. I went in and cause of loadshedding couldnt get my phone as systems was off, although, all they had to do was give me my phone and put it in the system once power was restored. I went in again 3 days ago and was told they gave my phone to someone else. If this is how you treat someone MTN and Autopage that has been a client for 24 years I would like to cancel our relationship. Its not as if the personnel didnt know I was coming back, they greeted me by my name every time from visit 2. To make it worse I have not been contacted by the staff to inform me of any progress. Please cancel this 24 year contract with 1 cellphone company, 1 account. Im disgusted with the lack of service and respect.