Microphones challenge with poor service at Mall of the South Cash Cruseders

I went to buy cordless microphones and when I arrived I decided to buy 2 boxes which each has 2 microphones. They didn't explain anything they just said exchange and refund is allowed in 7 days. When we tested Microphones only one set could work at a time. I forgot them at church so I stayed longer but I though this is just exchange because the sequence of the mics is the same but 14 days later I was told that I can exchange even after explaining that mics are working fine it's just that I can't connect both sets at the same time. They said I should have bought male and female and I asked how should I know that because I explain that I want my singers to use then same time. Service level was poor and they said to return the Mic they can buy it back for R330 when I bought them for R550.00 I then told them it's fine I will keep then and will report them. They didn't care and where not helpful.