Horrible treatment of bus commuters

I booked a Delta bus that was going to depart from Cape Town to East London on the 2nd of April 2026 and arrive in East London on the 3rd. It broke down in Worcester and they failed to send another bus we slept there and I hitch hiked to East London the following day. I wanted a refund instead they sent me a voucher equivalent to the R650 that I paid for the original trip, the bus was supposed to leave East London on the 18th but it was cancelled and I was forced to leave on the 19th. At the time time the trip costed R400 not R650 and now I am demanding the difference to be paid back to me but they are ignoring my emails. The reference number for the voucher is - DCAOLEO1.