Not refunded

I’ve made an online order with Polo they sent my order with missing item and They said they will refund me after I’ve made calls several times. They asked me to send the proof of bank account so they will refund me and I did exactly that and I’ve been calling them eversince I’ve sent the proof of babk account to Nkululeko Mamba (Polo South Africa) I’m so disappointed with their service. It’s the 5th month now still haven’t received my money back.