Truworths On-Line sales process is the worst...

Truworths On-Line shopping is a joke. Ordered a few dresses for my wife on-line as she needed a new dress for a wedding and obviously COVID. Their system and FAQ's indicate a 3 to 5 day delivery period for in store and up to 10 days for home deliveries. They eagerly accepted the payment on my instore account and actually sent the bill within 3 days. Here is where the problems began: My wife found another dress and I tried to cancel the order from Truworths. first they tell to wait and cancel once it is delivered. Of course the dresses arrived at the store the Monday after the wedding and of course they now refuse to cancel the order online or via the phone. After three calls to their call centre and being shunted from pillar to post we finally got through to the Canal Walk branch. The only alternative they can suggest is that I have to wait 14 days for the ordered to be cancelled as it wasn't collected. the only problem is that they expect payment by 5th of January which is Day 14. So naturally it appears as if I will listed as a non-payer for dresses that I cancelled.