I just want the mistake to be corrected, so to be able to still board on the 31/03/2023

I've bought a greyhound bus tickets at shoprite on the 23/01/2023, thinking that I've taken a wise decision to buy tickets early as when you buy at the time to depart its expensive. Tickets for 3 passengers, me and my 2 kids, under 10 yrs old. From Cape Town to Johannesburg on the 31/03/2023 and return tickets on the 10th April 2023. I've put the tickets far as the time to travel was still far. So yesterday 22/03/2023.i just took the ticket out as Im now preparing for my trip next week Friday. I just took a look to the times to depart, surprisingly to find that the tickets has been mistaken booked the wrong date, the date even passed long time on the 31/01/2023. I immediately went to the office in cape Town Station, but greyhound is now operating under Eldo couches. I explained the situation and the it's a mistake made where I bought the tickets, you can check on the system for that day that I never boarded as I was not aware the tickets got a mistake. They told me they can't do anything, even the time long passed. The only thing I wanted was for then to correct the mistake so I can still board and go see my family I haven't seen in a year. As the tickets were very expensive during the festive I couldn't afford to go home. Now I saved the money for is to go. But now this mistake happened. It's so sad that the money I worked hard to save, now is going to be taken just like that, I lost R1620 for this joburg trip only, as the return trip is correct. Which I payed R3255 for return of 3 of use. My kids were so happy that they going to go see everyone.😭😭😭