MBD is a ****

I've been garnished twice by the same company for Foschini account and I've paid both garnishes and now they have been harassing me with the same account saying that I'm still owing them. I did a follow up by calling them because I was not happy so they have sent me a statement showing how much I was owing them , according to their statement I've been overcharged by R6222 and now they are refusing to pay my money back. My name is Sindiswa Ntsume and my contact number is ***