From approved to declined in a day

On the 1st of September I app**** for a laptop on line. I came back approved. On the weekend a rep calles and said the laptop will be here on Tuesday (8Sept) that morning I had rearranged my whole day so called to get a reference number. The rep brought it to my attention that it was on back order and would not be delivered any time soon. As I needed the laptop urgently i asked if they could change it from online to instore as the Ballito branch had one in stock. They told me they could not do this. My only option was to cancel that order and reapply in the shop. This now came back declined. No one has been able to help me and apparently messed up my credit score. Vodacom i have really tried hard to get this contract but you have tried even harder for me not to get it. We have since tried decline review and to apply online and in store but all come back declined. Same device approved to declined. I will go out of my way to mention that Vodacom are not interested in their clienta or potential clients