UPGRADE NIGHTMARE

I had received a beyond bad experience from a service provider I have been using for 11 years now. I had problems on my previous upgrade Mtn apologised for the incovienience in 2015. I gave them a chance thinking that they value their customers however, now I did an upgrade over the phone on the 04/10/2017 with Hageshner Naidoo to a Sony xperia XA Ultra for R299 who advised that is in stock and have yet not received my phone, when I contact mtn for an update yesterday I got through to a lady called Danielle in upgrade sales she then asked me to hold while she calls a relevant department which deals with deliveries to check my order. I was placed on hold for over 10 minutes then she transferred me without letting me know, I got through to a guy by the name of Tebogo in another department who then said he won't be able to assist as the previous agent was suppose to give me a reference number or order number to track my order. I then called upgrades again I spoke to Nonhlanhla who advised me to call ********** 622 as she will not be able to assist me, I then requested to speak to someone superior and she escalated a call to Boitumelo who advised that I contacted an incorrect upgrades department since they got 2 upgrades departments. She gave me an incorrect number to call which is ********** 040 which went through to someone not even related to mtn. I then decided to call a number that Nonhlanhla gave me ********** 623 and I spoke to a guy whom I forgot his name and advised that my order is still at the warehouse and he said he does not understand why I was not contacted to be informed that my order will delay as there is a problem with stock. He promised that he will send my contact details to Hageshna Naidoo who processed my upgrade to call me before end of business today I still have not received a call. I was also suppose to receive 10 GB promotional data(for first 3 months of an upgrade) on the 14/10/2017 of which I did not receive. I called regards to that on the 16/10/2017 an escalation was done and I was advised that I will receive 2 sms' advising on a turn around time of which I did not receive and the one with a reference number of which is the only sms I got, until today still have not received my 10 GB of data. The sad part is that they will still bill me for something I don't have because of their incompetency. Should I have been advised the day I placed an order that they don't have stock I wouldn't have upgraded as I urgently need a phone.