Disrespectful attitude towards a customer

I went in store (Gadget Fix at Oakfields Shopping Centre, Benoni) to upgrade a contract for my nephew, requesting the IPhone X and Apple Series 4 Watch. The sales consultant, Wally, told us the I Phone X was on backorder and would take 3 weeks, which was the duration of school holidays. We left satisfied with that and I told my nephew it is something to look forward to. I then made follow-ups with Wally every week, which I felt was poor service as he didn't go to the effort to give me updates as a good sales representative should do, but on one occasion did not even return my call. After the 3 weeks passed and my nephew went back to school I did another follow up and was given a date the stock would be arriving. I phoned the morning of the day the stock was supposed to arrive, only to be told the phone is actually discontinued, and that we were supposedly informed of this on the initial visit. (As mentioned above, we were told it was on backorder and would take 3 weeks, not that it was discontinued). Anyway, I requested other options so as not to disappoint my nephew, and were told either the XR or XS, both at a higher price (XR on 24 month contract not 36 month, XS a more expensive phone). I confirmed stock with Wally in the morning, and informed him I would let him know the next morning. He said that is fine. I feel due to being inconvenienced, a special deal should have been made for us, nevertheless, we decided to go ahead with the XR, and I phoned Wally that afternoon to tell him we are on the way to collect. He then told me he had sold all that stock that same day so he did not have any in store. I told him this is very frustrating and making me angry because of the terrible service, and he proceeded to ask me why I feel the need to get angry and say their service is terrible, is it because I am not getting my way with the phone?! How unprofessional and rude! I told him I am on the way and he must wait for me so I can sign the papers so he can get the order in for the next batch, which he said will arrive in two days. He again goaded me, telling me not to "dictate" him. I walked into the store, sat down at this desk, and told him I am here to sign my contract. I also told him, all it would have taken was a bit of feedback, and an apology for the poor service, but instead he wants to argue with his customer, and make his customer feel as if she is at fault. He then told me "If the service is bad, go to another Vodacom, I BEG you", and "I am not going to help you". He sat there and refused to help me, so I had to go to another desk. How shocking is this service??? I have never been treated so poorly before, and for a store representing Vodacom, this should be attended to with urgency! A sales consultant should give feedback, speak with respect to ALL customers, and solve the customer's problem and calm the customer down. I am completely disgusted in this lack of service, and complete disrespect shown.