I bought my dd clarks shoes for the start of the new school year in September. However, the last few weeks the part in the heel where the toy was is collapsing in on itself. I'm going to have to buy her some new shoes but would I be unreasonable to expect these £30+ shoes to last longer than 3/4 months? I've no idea where the receipt is but as they're faulty would I be ok to return them?