Order more than a month late

I ordered CIMA textbooks on Take a lot and the order was promised to be delivered with 15-20 working days. I followed up before the 20 working days to ensure that my order would be delivered on time only to be told on the 20th day that my there was a problem with the order and would only be delivered within another 15-20 working days. I then called take a lot to confirm if anything could be done to expedite my order and 4 days later there is still no response from take a lot. How I wish I had ordered directly from Amazon or Kaplan.<br> I am so annoyed.