Flight Canceled no refund

Good day

I called your office and canceled my Cape Town flights due to the corona, I was informed by your agent that FlySafair would email me a voucher which they did. The agent said for Kululu I had to call them and request my refund from them, I phoned Kulula and they told me they don't get involved with Travelstart bookings. Travelstart must process my refunds. Could you kindly assist because I canceled my flights with you three weeks ago and had to call your offices last week again before action was taken? I want my kulula refund.