I've had this happen many times as well - a non-itemized invoice for services rendered six or more months ago. It's not my problem that they can't get their bil

I've had this happen many times as well - a non-itemized invoice for services rendered six or more months ago. It's not my problem that they can't get their billing service sorted. When I worked in the oil industry, vendors were expected to bill promptly (within 30-60 days) or not get paid.