No response for compaints at Qater airways complaints

We missed our flight and had to wait 24 hours for a new flight, which was ok, but we missed our connecting flight with 2 days. We lost 2 days accommodation at our destination. I have written many complaints, but not any reply from their side, even thought we have case numbers. On the mail it said they will contact you withing 48 hours. But since the 1st of January no one has contacted us.