Bill.com - Good product, unprofessional company

We're a startup business that's growing rapidly. We needed a way to pay our contractors that integrated with QuickBooks. Bill.com seemed to fit the bill (so to speak). We tried it for a month and it worked well for us. However, six days after the trial ended and before our next pay run, I received a terse and unprofessional overdue notice. Three days later I received the same notice simply re-forwarded with no other explanation.

If this is how Bill.com treats potential customers, what is its customer support going to be like? I for one am not signing up to find out.