Wrong size

[curlamb1066]

I bought and paid for some dance sneakers/trainers on ebay that were supposed to be a size 6 but clearly upon opening looked liked kids shoes and they are in fact a 4.  Ebay do not want to know as the seller posted a pic of a label inside the tongue that says size 6.  I was onto Ebay yesterday, passed around and told they were putting me through to paypal for a full refund as they were not fit for purpose, it rang once and I was disconnected.  Today I tried again, got through to one person, she put me through to escallation dept, he is like a record saying the label says 6....  All the seller had offered was £2 refund on the postage but they are not fit for purpose, it's not about the postage it's the fact I cannot use the shoes.  What can I do?