Taxi fare from airport to Hotel Estrel

Due to delay of Air Berlin flight AB7753 PMI-TXL, your company arranged an accomodation at Estrel Hotel for us and told us to take a cab to the hotel and back to the airport and claim for refund through customer service. We paid for the taxi for the round trip 45 euros + 45 euros= 90 euros. We have the two receipts given us by the taxi driver and would like to know how we can be refund. Thanks for your answer