Broken parts and no refunds

I bought a part from them that on delivery was broken. They picked up the part the following day again promising me a refund. Andre the gentleman I was dealing with stated that they bank with fnb and the money will reflect the same day. This was a week ago. I have subsequently followed up daily to be told i they will follow up and immediately get back to me. 5 days in a row now the exact same empty promises and still not refunded