Administrative nightmare with the accounts department

There are two sides to The Courier Guy. The logistics and delivery and are mostly excellent. However the back office accounts department is an absolute shambles. Constantly having your account suspended when no invoices or statement have been received. I was once suspended when I had a credit on my account of over 30 days! Go figure that out. A current statement says your balance is "Current" but you are still suspended as invoices from before the 27th of the previous month have to be paid by the 7th of the next month. So much for 30 day accounts, that's only 10 days!!!! No notification via email of your account suspension, you only find out when you try to book a collection. They tell you that you have to send in Proof of Payment, but this is not mentioned anywhere on the invoices and statement. They also don't tell you who to send it to. If you have another courier in your area, consider changing.