I have now discussed this invoice with xyz and have been asked to pay you for the first three days, making a total of £xyz. Your cheque has gone out first class in last night’s post. The dispute had slightly delayed processing.

When you dispute an invoice, you’re supposed to actually contact the person who you’re disputing the invoice with. Seeing as that’s not that case and I don’t particularly like you or your company, I’m going to sting you for every penny you owe me.