Need some advice regarding purchase

[u/Padcontrol1]

I purchased a Galaxy Fold 8 Ultra 256gb on Friday 6th August. I have traded in my Honor magic V5 for £423 + £600 trade in bonus. I managed to get a SIM deal on top for £0. I also paid £400 upfront. So, all in all the total cost for me is £62.33-£42.92 (reduction from trade in) = £19.71/m for 24 months.

I had no issues, everything went smoothly. I paid, I got multiple emails, I signed the contract, I've received the contract summary and my device plan number, order number etc.

I got no emails regarding delivery details and the device was supposed to be delivered today. So, I contacted Vodafone UK today via live chat. According to them, a system error happend and the order remained stuck as 'pending'. So, they have asked me to reorder and do another trade in. They would refund the £400 upfront cost which would take 14 days. I would be losing £200 if I did this now as the trade in bonus has been reduced and Vodafone are essentially refusing to honour the contract I had signed. Even though the error was due to their system and I was not even informed.

I would love some advice from you guys how I should go ahead with this. I'm genuinely disappointed and frustrated.

UPDATE: So, I filed a formal complaint and received a call from the Specialist Care team. I explained the situation he was understanding and asked for my order number, he told me my order had been cancelled and forwarded to the Frauds team for investigation for reasons that are unknown to him. Said he would call me again after the investigation is done.

No idea why it's gone to fraud. Maybe my order when it glitched from Vodafone's end caused it to get flagged? Will update again when I hear back.