Iexchange has still not fully refunded

So as per last review. We went on holiday and the place was double booked. We drove from Johannesburg to Margate. And had to find a place to stay and drive back the next day as I exchange was not open in the weekend. I exchange made an agreement of an amount they would pay back to my mother. But only paid part of it. We are still waiting for the rest. And my mom has called and emailed no response. We are waiting for the right thing to be done!