Angry

So I booked flights last year to travel around easter time. Shortly after, lockdown occurred. I'm trying to rebook and I'm being restricted with my flights. I cannot exchange it for a return can only do it for a one way. I paid cash for the flights but now I'm being penalized for lockdown occurring. I'm not happy and feel that I'm being treated unfairly. I will never book with travelstart again as they do not have a call in centre either. Everything must be done via online services. Pathetic