KLM not delivering on their promise - Flying with Confidence

We have had no assistance from Customer Service to resolve our issue. It is extremely difficult to get assistance from the call centre (if calls are answered) and no one seems to be working on our request. We keep getting messages that our refund has been processed, but we have not received the full funds. We have also had no response to our compensation request. My son booked a flight in March to travel to SA from the UK in June. The cost was £598.27. Due to a system error the payment was not processed and he did not receive confirmation of the flight, so he assumed that the flight had not been processed. He booked a second flight at the same cost and received confirmation. The following day he realised that the first flight had been processed without a confirmation being sent. He had TWO flights and funds had been deducted for BOTH, so he cancelled the one. Again, due to a system error, a cancellation confirmation was not processing or coming through. So, he cancelled the second flight thinking that he still had the first. Three weeks before his flight to SA he decided to check out his flight on Flying Blue only to find that he had NO flights. BOTH had been cancelled. After MUCH hassle he got hold of a consultant who informed him that he would have to rebook a flight from scratch. At this point the flights were £1592.77 (TRIPLE the amount). That's what he had to fork out to get home and KLM just shrugged their shoulders. It is truly outrageous - due to KLM's system glitches, we had to carry the cost of £998.50. In rand that a huge sum and we have heard NOTHING from KLM in terms of compensation. Up to this point they have fully refunded one of the flights. Only partially refunded the second flight that they cancelled in error and offered nothing in terms of compensation. This should not be allowed to happen.