Inconvenience of APM Bus

I have never experienced such a heartache from apm buses on the 13th of December 2019. I had booked 13 bus tickets in August that go from Johannesburg to Durban for the 13th December 2019 for my clients.. When they arrived for the bus departure at 12:00 for the 13:30 bus they where told the bus was canceled the only bus available was the 22:00 bus neither was I informed by sms or email that the was going to be a problem. When I called the head office I was made to hold for 30min then they hung up.After trying to call them there was eventually no answer.. My clients called me fuming was call because they were shocked.The person that had told them the bus was canceled told them she will only assist with the refund nothing else can be done. I had bought the tickets on an off peak season meaning the tickets were cheap at that time so they had to buy tickets from other bus service providers to reach Durban. Luckily we found tickets from eldo coaches bus leaving at 13:30 but they were R310 the tickets from APM where R220 so i had to add R80 on all 13 tickets because they were on peak season . Such great inconvenience I have never seen I had neve budgeted for all that money I though APM was a reliable bus as It was my first time using it and I had people recommending it to me. Is there anyone who can explain to me why wasn't I informed about the cancelation of the service.And what about the money I lost?