Hello, my name is***** am a qualified lawyer and I will be assisting you with your question today.
How long ago did you have this installed?
OK thank you, ***** ***** it with me. I am in court today so will prepare my advice during the day and get back to you at the earliest opportunity. There is no need to wait here as you will receive an email when I have responded. Thank you.
Many thanks for your patience. Just because an invoice was issued does not automatically make it legally binding. That could happen but it would depend on the circumstances. One may argue that an invoice is the ‘offer’ part of a contract, which if accepted by you and paid up it would form a legally binding contract. However, errors do happen and a party should not be allowed to take advantage of a genuine error by the other if it is clear that this was the case. So even if an invoice was issued to you with a certain amount, if this was clearly done in error, they would be allowed to correct it, especially as the error was spotted so soon after. This would depend on what work was being carried out, what parts of it were not supplied and so on. In the end you would need to check what the cost of all of this were and come to a figure which you can use as a yardstick in what they should have charged for their services. If it is clear that this was much closer to the new amount than the old one then there is a clear argument that the initial amount they invoiced was wrong and that if it was a genuine error they should be allowed to amend it. Of course that does not prevent you from continuing to negotiate with them to try and reach a more amicable deal.
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