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By providing a specific guarantee that the payment was verified and secured they varied any other terms that they are now seeking to rely upon so they are liable.
I assume that you pay the site for the work provided so you have a contract with them and the have a duty of care to you as well to execute the contract with reasonable care.
They were aware of the potential problem but did nothing about it.
I would threaten to sue them using the online money claim system which is pretty straightforward.
If there are any further points please reply I will be happy to respond.
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