Back in May, we issued an invoice to our customer Oranges Ltd* and payment was subsequently received from Lemons Ltd* referencing that invoice number. Prior to this point, we had had no contact with Lemons Ltd. As far as we were concerned we had been engaged by Oranges Ltd to perform our services but as the payment had our invoice number as a reference, and was the correct amount for that invoice, we matched the payment to the invoice and that was that.
We have now, 6 months later, received an email request from Lemons Ltd (the first actual direct contact we have had from them) saying they need us to credit the original invoice to their 'sister company' Oranges Ltd, and reissue the invoice to their name and address. This request has our contact at Oranges Ltd copied in, who has also reiterated the request, but looking on Companies House, the two companies appear to have different directors and shareholders. I would like to refuse on the grounds we were not engaged by Lemons Ltd, have no contractual basis for reinvoicing them, and frankly doing so is a bit of a pain as we closed our ledger for that project when payment was received months ago.
Would anyone disagree with my position for refusing the request? They are being quite insistant it needs to be done but I'm not comfortable with it.
* Not the real company names, obviously.