Furious about aparent discontinued Samsung Galaxy S9 Plus

I went to the MTN store at Springs Mall on the 4th February 2019 as I was due for an upgrade on my contract. I saw that they had the Samsung Galaxy S9 plus on promotion in their February 2019 online catalogue and you also receive a Samsung 128GB memory card with the upgrade. Ilana was the consultant that assisted me with the upgrade and informed me that they currently do not have stock for the specific phone but that that they will receive stock in that week or the next week. We did the upgrade and I've signed for the upgrade. On Monday the 11th February 2019 I phoned Ilana to enquire if they have received stock because I haven't heard anything yet. She informed me that they are still waiting for stock and will let me know as soon as they receive stock. On Friday the 15th February 2019 I again phoned to find out about the delay and was informed by a male consultant that Ilana is on leave and that there is still no stock and they don't know when they will get stock as there is many people waiting for this phone. On Monday the 18th February 2019 I went into the store and spoke to Chantell to find out if I can do the upgrade online and receive the phone from their online store. She informed me that the upgrade has been done online and the phone will be delivered at the store. Today 21 February 2019 I phoned the MTN Online Store and was informed that apparently the Samsung Galaxy S9 Plus has been discontinued. I phoned MTN Springs Mall to find out about the problem and was informed by Ruanè that they are not aware of the phone being discontinued. I requested her to find out from her Area Manager what the problem is and why I haven't been informed of this from the beginning. She informed me that she is busy with a customer and cannot find out now but will let me know. I then phoned Anien Van Eede (management from the MTN Springs Mall store) and she said that the phone is not discontinued; they just don't have stock and I have to be patient. While I was talking to her about this she also confirmed with some colleagues that was with her at the time about the issue and they confirmed that the phone is not discontinued; there is just no stock available. She then said that she will find out which store has stock and will ask the MTN Springs Mall to phone me when they find any stock. A few minutes after my conversation with Anien Van Eede I received a call from Chantell at the MTN Springs Mall who informed me that the phone has been discontinued and that they can give me the Samsung Galaxy S9 or the Samsung Galaxy Note9. I am furious because how can the online store be aware that the phone has been discontinued but the store it self has no idea. Even Anien Van Eede who is from management told me that the phone is not discontinued but now all of a sudden that is the case. This is pathetic service. I phoned Vodacom in East Rand Mall and was informed that the phone is not discontinued, just two colours are discontinued and the black is not one of the colours. I want to know what the problem is!!!!!!!!!!!!!!!!!!