The Poorest Service Delivery ever!!

I have made a booking for the 17th -19th May 2019 which is paid in full. I have in the meantime fell pregnant and wanted to request that I move my booking out to May 2020 as I will not be able to enjoy the resort benefits and offerings to the fullest whilst pregnant. I contacted First Group Magalies Park to request to amend my booking or alternatively reverse my payment. Reason why I contacted them is because I have received the confirmation of my booking from them. They then advised me to go online and make the changes myself, however you can’t amend your booking online. It prompts you to log in, but I’m not even registered yet. How do one register. I then phoned back just to be referred me to Magalies park directly. When I phoned your reservations department, I was referred back to First Group Magalies Park and advised to speak to Christina or Tiffany as I have paid in full and they would be able to advise. When I phoned and spoke to Tiffany, she yet again gave me the run-around and said I must speak to Magalies park directly as they will not be able to assist me. When I phoned Magalies Park again, I requested to speak to a manager, to which Heidi (Front Desk Manager) took my call. After explaining my situation she promised to phone me back in 10min with an answer. I waited a day. I then followed up the next morning with a call, to which she commented by saying:” have they still not phoned you back to confirm as I have requested them at First Rand Group to amend your booking and promised again that I can expect a call in the next 10min as she will take this up with reservations. This was 4 days ago!!!! This is the poorest service delivery EVER! Can someone please contact me to provide me with confirmation in terms of my booking or reimburse me. Yolandi