If the work has actually been carried out and is properly payable under your engagement letter/terms of business with them then there is nothing preventing them issuing the invoice now I'm afraid.
If the invoice is not detailed then you can request a breakdown of their charges so you can examin it against the work that was actually carried out on your behalf. Ask for itemised billing by letters in/out, emails in/out, telephone calls in/out, attendance hours, drafting hours, perusal hours and travelling.
If you dispute the bill you will have to initiate their internal complaints procedure, this might result in getting some knocked off it. If you are still unstaisfied after this then you will have to refer the matter to the Legal Complaints Service.
Sorry it could not be better news.
If you have a dispute that the work carried out was not the work you actually instructed then to carry out then you have to initiate their internal complaints procedure, but this does not prevent them from issuing the invoice I'm afraid.
Ultimate payment, negotiate on, or cancellation of the invoice will be sorted out as a result of the their internal complaints procedure or via the LSC.
I hope this clarifies, if so please kindly click accept.
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