Terrible flight experience followed by even worse after flight service

Flight delay from Barcelona to Frankfurt on 1 October caused us to miss connecting flight to Cape Town. We emailed Lufthansa the details on 4 October, and received no response until I followed it up with a phone call to their UK tel number , as local one could not assist, and was then told telephonically that claim for compensation had been rejected due to fact that initial delay was not lufthansa’s Fault. We also have a claim for the cost of an upgrade that , although paid for, was not given to us. This claim is , according to Lufthansa UK, still under consideration.We are still waiting for this refund.