I'm angry

My name is Maria My son brought sneaker online a day before they dropped, he then called them to infom them that he forgot to attach his order number n they said they've noticed it,they received the order they then sent an email a day after saying it sold out fine.they said they'll refund him 'is been 3weeks now, no refund, they don't answer our calls, email or even whatsapp. We went to the store 3 tyms but haven't got our R2600 refund.