Non-existent communication and total lack of accountability

I received ZERO notifications or confirmations from Qatar Airways when booking flights to Europe. Consequently, I had no idea whatsoever that the customer service agent had cancelled the WRONG booking until I tried to check-in for my return flight (which now no longer existed!). I then had to extend my stay by two days and purchase a one-way ticket at double the price of what my return flight had been.

Qatar Airways takes ZERO responsibility for this and their call center's reasoning is that the original return fare was (eventually) refunded so there is nothing they can do about it.

I spend extra money stuck in Brussels for two days plus having to shell out for a one-way ticket home.

The lack of accountability for their employee's mistake is unacceptable for what is supposed to be a reputable airline, and the total absence of communication is utterly baffling (how were we not notified that our booking had been cancelled or that there was a refund in process???).

Extremely poor from Qatar Airways. At this point I don't know where to turn to try and receive compensation for my financial losses.