City to City refuses to Cancel Ticket and Refund Me

My girlfriend bought a ticket to leave on Sunday from Johannesburg. On Saturday she realized, she have to leave on Monday instead of Sunday. She called me on Saturday to book a ticket for her for Monday since she cannot access the nearest booking shop. She planned to go and cancel the Sunday ticket on Sunday morning at the City to City Park Station Offices. On Sunday morning I went to buy ticket for her while she went to cancel her ticket. After I bought a ticket I Whatsapped her the picture of the ticket. She immediately told me that City to City refused to cancel the ticket instead she must pay a fine of R70 to postpone the ticket to Monday and she agreed. At the same I told her that I already booked the ticket for her. This imp**** the double booking of the tickets. I immediately called City to City to cancel my ticket and asked for refund. I called numerous times during Sunday afternoon (from about 11am) without any success. The phone will just go dead while holding for the operator to answer. On Monday morning I went to Shoprite and Checkers to cancel the ticket but they couldn't help. They told me to call or go to City to City office. The Kimberley town doesn't have the City to City Offices. At about 10am on Monday I managed to get hold of the agent on the phone. I couldn't get any help since the operator was very rude and not assisting me. She told me that I must cancel the ticket 24hours before the departure. She told me its company policy and I they will not refund me, its my problem. She told me to postpone the ticket and use it other time. I find it unfair that when I bought the ticket, I was not told about the 24 hours. I tried to call the call center ***) but I got no assistance. I tried this 24 hours before the departure time. The operator, who helped was very rude and have no customer service qualities.