Horrific Service at Qatar Check in at the airport

Qatar Airways is the worst ever, and as for the staff at the airport that is just so rude and unhelpful its disgusting. To top it off they do not even do their job properly and I our luggage was left in Doha instead of being booked through to get to Dusseldorf our final destination. From trying to check in online then calling call Centre and getting cut off numerous times (which connects to another country) for them to tell you that you can go to the check in point at the airport and they will gladly assist with you booking. But that was not at all what we experienced. We asked id we could please sit together and we were told no its not the same booking, then my husband asked for an aisle seat she said no, and when we told her that we had an aisle seat assigned when I tried to check in online, then we were told show me your proof. This is a business trip and we are now having to see clients in our 24 hour tracksuits we were wearing. I cannot explain my level of disappointment and just the plaint down horrible service received towards a customer! This has left a bitter taste in my mouth and will never use this airline again!