Bluey Childrens/Kids Duvet Cover Set

Size small I thought it was 135×200 Mede 120x150 I need you to tell me the best way to make the return as the size of the item is too small and the product description did not contain information about the measurements, they automatically mislead as the image shows a children's bed, a single bed and the size the cover came from is for a bed with rails... I advise you to provide a more detailed description so as not to mislead customers..... They can also create an option to return the item and refund as it is not found anywhere in the order or on the website, which makes the process quite difficult.