Tech to purchase online

Fnb Had a 187 deal cause of Fnb Birthday, so when I wanted to purchase 1 of the products they at advertised.Every time when you out the virtual q to pick and pay for the item then their is a crash or freeze so I was told their was to much people online the Fnb app . FNB new what was going to happen it’s the same thing if their is to much people on your house WiFi then it’s to much intermittent after I saw everything is sold. I was called if I still want the item but at a normal price so I said no I want to pay the 187 per month for 24 months for the item tech I had to pay normal price for for the item so cancelled everything