Share buy stuck awaiting confirmation

I have had an order sat “pending” since around 2:30 GMT Today (6 hours) and it still hasn’t confirmed, I am unable to cancel this as it says “it is not possible to cancel this order as we’re awaiting confirmation that is been executed”.

The price which I was trying to buy at has since been altered massively and so I obviously no longer want this buy order. I was unable to put any other buy orders in all day because of this issue and yet it’s still not resolved.

Please can my order be cancelled and my funds returned to me so I can get back to investing.

Please see attached