Missed initial investigation

Hello, half a year ago I bought my first new car Citroön C4 Grant Picasso. I was totally thrilled and apparently did not pay attention to the first conversation and did not know that soon about 1500 Km the initial investigation is on. I totally missed it and now I have 10000 KM and the factory town says that I will get rid of my guarantee. although I have extended extra 1 year. I am totally angry that nobody from the factory town and car dealership has reported and asked How do you think that?? Is this really all my fault with the guarantee menur and has it already gone??