Intercape - Ticket refund

I booked my ticket online. As I was supposed to return on the 17th march. I tried to reach intercape to reschedule my date to the 18th march. Unfortunately i was in a remote village in botswana where network is a problem. My phone was offline. I went to the office before departure to explain and i was told to purchase another ticket. I emailed their office to be compensated my first ticket while onboard after purchasing the second ticket. The response was i have forfeited my money. I am still asking intercape to kindly consider to refund me as i have encountered a matter that was beyond my control,being offline due to network failure.