Please do not purchase from this retailer!!!

I placed an order with a pre-paid Visa, knowing that after shipping costs, I'd need to put the balance on a second card. Well the order went through with only one form of payment. Knowing I still owed about $2.50, I emailed the company to ask if there was a number I could call to remit payment. I got a scathing email scolding me for having the audacity to put my order number in the subject line. Shame on me! They then sent an automated email advising me that they reserved the right to send my account to a collection agency unless I called and made payment. Side note - this email included my order number in the subject line. Originally I'd have paid the difference and went on my way but I was so incensed by their rude, condescending emails I told them to cancel the order altogether. Then they replied that my order was non-cancelable (is that even a word?) and that they would be sending my account to collections. Still don't know what for - I received no products so what am I being charged for? I am being send to collections yet they never even billed me? This is insane! Now I have to worry that a creditor is going to come looking for money for products I never even took ownership of? I feel like I am in the Twilight Zone. Avoid at all costs. I've already filed complaints with the FTC and the CA Attorney General. Honestly this person has no business selling anything to consumers.