Minuteman Press Charge me for services I never received I was promised it would be done in a week and tried to access my product for three with no results 6 months later I still have no product fort myers, Florida

I have just received a bill from this company stating that if I do not pay for the product they will send me to collections. However I do not have the product in which they are billing me for. Back in April 2011 I dropped off my canvas with a painting to be reproduced and printed. I was told it would be done the next week. I had a deadline to meet with this product. The next week I called and was told it wasn't done. I called on numerous occasions and even stopped twice in for the next three weeks trying to get my prints of my original painting. Every time I was told it was not done with an excuse of why. I was able to obtain my original painting with no prints after three weeks. I had to take my painting to another company as I had already not met my deadline but needed my prints done. Since I had chased down my prints enough I left it up to them to contact me when they would be done. I was never ever contacted by anyone there to let me know my product was ready. However just recently I received a letter in the mail for them demanding money for prints I do not have or know where they are. Stating if I do not pay they will send me to collections. I am unsure why I am being charged for a product I do not have or for a product that nobody ever contacted me about. This was back in April my deadlines are way overdue and when I was promised a week and I had to chase them down for three with still no return on my product this is unacceptable. I would have gladly paid for my product if it was done in a timely manner but this is not timely. Also I have used their services before and paid them for them with business cards. This is why I chose them to reproduce my prints as they were awesome before. But to expect me to pay for a product I do not have 6 months later that is not right. However I do want to add when I contacted the company yesterday about this dispute this was the response I received today from the company

"please feel free to go forward with your threats, lawyer, BBB etc.. we have called you and been sending statements for a couple of months. Your canvas pictures have been ready for months.
Naturally we will go forward with any actions we are free to take."
 
Please note that they stated they have tried to contact me for a "couple months" couple meaning two it has been six months. That means after 4 months they have recently started to contact me? I am not understanding how they think this is a timely manner. Also I have not received any phone calls or messages on my answering machine from this company. Only my recent bill with threat of turning me into collections and I still do not have the product.