Mbali

I have problem with ...

I have problem with the cashier from that shop ,because I went there to do a luybuy last year October I wanted a Fila tekkie size 10 and they only had size 11 by that time so they told me to luybuy size 11 then they'll exchange for me when I take out my luybuy..it was fine I didn't have problem...now that I went there to take out the laybuy they're saying they can't exchange for me they don't do exchange and they no longer have any stock available. Fine when I say I want a refund they said they don't do refund at all so I want to know of is that possible????they even said they didn't force me to come to their shop please help me