CANCELLED ORDER AND NO DELIVERY FROM 28 NOVEMBER (SPORTSCENE)

Good day My order number is p**********967. I placed this order on the 28th of November and I have not yet received my delivery in full. I have placed an order for 4 pairs of shoes on ONE order but only 2 was delivered on the 2nd December. On the 2nd December I have received an email saying: Unfortunately, we have had to cancel one or more of your items in your order p******967 placed on 28 November 2019 due to insufficient or damaged stock by the time your order reached our warehouse. which I fail to understand it why allow me to finish the whole order with availability of stock then come back with such information and also invoice me then let me know everything was APPROVED. When I called the online store they were willing to help me place an order for it on normal price but no stock for black Friday delivery how so??? I want my daughter shoes and a NOT REFUND. With regards to the other pair which is still active and invoiced for no delivery has been received. As per your messages to me deliveries will be done within 3 to 5 working days and today it marks 2 weeks of NO DELIVERY. When I called I was told to call RTT courier to do a follow up and they will do the same and call me back but no one call me back. RTT courier has been sending me non stop sms and emails saying my shoes are out for delivery from the 2nd December till today. No One is willing to help us and I have received BAD SERVICE from both companies.