@Alexandra Tarek as far as I know Qatar Airways has a Customer Care Centre Dept. which  caters all the customers' complains. You can check the details in their website there is like " Tell Us " . If you missed your flights because of the mistakes of the airline you can explain to them and for sure they will compensate it. I suggest you better visit the ticketing counter of Qatar Airways Head office. Hope they will consider your concerns. If you have problems with the staffs at the ticketing counter which you had mentioned in that the staffs at the counter and you were telling that staffs were rude, I guess customer has the rights to complain? This is my humble opinion only