Convertible seats are not sold in Turkey that's why I have to purchase one from US, so I don't know much about returning options for a purchased item. And also another problem no online stores ship products to overseas. I always have to give my relative's address to the seller and they send it to them and then they send it to me. So it takes a little while for me to get the item I bought.
Britax responded my mail saying "Based on the Model Renault Megane 2003 5 door we tested we found that the First class si fitting it rearward facing that the seat belt buckle was too short and outer anchorage point was too forward causing the seat to twist on impact, which made it unsuitable for this particular vehicle." What I understand about the latter only way I can see whether it is safe for my car is to have an impact. And also they said it not legal to use a model designed for US in an European car for the safety regulations are different. I think for now I will stick to my Maxi Cosi
Infant car seat (used up to 13 kilos- appr. 28 pounds) and later try to change my car based on the
Britax's car fitting information in order to get the safest seat possible. Thank you very much...