Refund not paid -***

My virgin active account *** I have paid. Before I settle this account I had call mbd to get details that 8 can use to paid in the settlement so on that call I was told that if pay off this account I have 30% off discount so I was happy the guy sent me the number I will use to pay with at the shop when I got at the shop they ask me how much I was paying because I was not sure if u need to pay R1490 or R1049 do I made a payment of R1490 after my payment I called mbd I was told I had paid extra and I will be refunded my R400 within 2days after the money reflected on they side after week I called I was told they do see that I have paid extra R400 but the person I was talking with can't help me so they will be in contact with me the only thing they will help me with was a paid up letter only and I ask when that person send that email should state that my refund will be pay she refused to do that she said that the letter was automatically sent which was a lie because I was a email from her long story short is that they still have not refunded me