Unfairly treated

Good day<br> <br> We have received bad service from Mercedes Benz Polokwane.<br> <br> On the 25th Jan we called to book the car in for 100 000 km service. The car was still at 98 800km at the time. <br> <br> they only gave us a date for Monday of which by that time the car exceeded the kilos by 300. <br> <br> It has now been made our fault that we have one car which we had to use during the weekend. We were forced to pay R4000 for the service which was supposed to be part of the service/maintenance plan of the car.<br> <br> Please assist us in getting our refund back.