Still waiting for refund

Good day

I ordered a yoco machine, the transaction went smoothly and I received it, we tried using it but discovered that it needed an a cellphone with data to allow transactions to go smoothly and also the machine didnot have network due to the area we in. We then decided to hand machine back to which it was collected. I sent numerous emails to yoco stating I am still waiting for my refund and weeks later I still havent received all my money. This is frustrating