No refund after system error and promise to refund

Travelstart should be renamed to Travelstop... I nearly missed a flight to my parents in Namibia to celebrate my dad's 75th birthday due to a booking glitch on their website. I had to purchase a new ticket and by the grace of God got a seat due to a last minute cancellation at that time. I couldn't get hold of Travelstart as they only operate certain hours. They phoned me after the first leg of my travels and promised telephonically to refund the ticket I had to purchase. It's been more than 3 months and I am still waiting for my refund despite the fact that I requested the refund over and over. I will never use them again. I am disgusted that they confirmed that my refund has been issued 3 months ago and every time I follow up their automated response is that the issue has been resolved. Unacceptable.