Matrix Warehouse Fourways Crossing does not want with my refund.

Its goig to the second week waiting for my refund from Matrix Warehouse i Fourways Crossing. I paid them for hard drives and took 2 hards drives ssd instead of 1TB and they gave me a credit note which they were supposed to refund last week. now they keep telling me the lady who does payments is off sick ..

Please pay my refund .