Complaint Letter 3 - repost

The incident is as follow. We have been doing business with this vendor for almost 10 years, our payment is always pay on time within certain time period. However, their accounting staff, always phone us around the payment due date saying that if we don't pay by certain day, our account will be suspended. Their staff's attitude and tone is horrible, we felt that we were being harass on a monthly basis, keep receiving message such as suspension on our account. I also want to point out that, we bring in business amount to them 3x more comparing to a year before.