Me: Hi, we haven’t received a payment in over three months.
Client: I haven’t received any invoices from you so I don’t owe you anything.
Me: We send the same invoice for the same amount each month at the same time.
Client: Well I didn’t notice them so I don’t owe you.
Me: OK, we’ll need to start shutting down your services then.
Client: What? I depend on those to make money! I’ll send a payment in full.
Me: Thanks. Would you like a statement for all invoices?
Client: No, I found them.