Won't reschedule/refund bus tickets

Good day everyone. So my experience with this bus company has been just awful. At first it was quite a struggle to buy tickets through this company (we chose this one because it was the cheapest and it didn't have that many bad reviews) but finally on the 28th of August we bought 2 tickets going from Pretoria station to Welkom, leaving on the 30th of August. Unfortunately due to circumstances beyond our control we were unable to make our bus, we tried to call before it left to say that we won't be able to make it to ask if we could exchange our tickets to a later bus but we were unable to get through to their call center. About an hour later of trying the number provided on our tickets and also the number found on their site whilst still not getting them to answer we called the Shoprite from where we bought the tickets only for them to tell us that we should have called earlier to reschedule despite us calling the company itself for the past hour and that the last bus for the day had already left. We had to get a lift and make extra expenses to get to Welkom late that night but thankfully we got here safely, but now we would just like to know where we stand. We've tried calling from multiple cell phones and also a landline to get in touch with the call center since Friday and today they finally answered our calls, only to once more tell us that we're at fault for not calling earlier and cut the call refusing to listen to us. Now we have to go back to Pretoria but we have no money left because the money for our return tickets we had to use to make other plans to get here on Friday. Absolutely horrible customer service and it saddens me to see how horrible they treat their customers, I hope nobody else has to go through what we went through.