Omicron COVID19 flight cancellation 30 minutes before scheduled flight?

After inconsiderate cancellation of my trip to Europe last year on 26.11.2021 that was booked through Travelstart "agency", Qatar airways have never compensate me for the costs and inconvenience caused by their actions. Firstly they have changed my booking form the original departure day to next day without informing me timeously about. Needless to say that the COVID19 PCR test required for travel had to be repeated for the day after, as it would expire by the time my family would reach the final destination. And after taking the second PCR test (every time 4x R800.00=R3200.00) they have cancelled the flight that I haven't booked originally. The flight cancellation happened as we were about to board the plane. The costs of Traveling Visas for my whole family, costs of transportation to and from airport, cancellation of the pick up at the destination point, accommodation reservation are on my account? Even thaw I haven't done anything to Couse the cancellation. Please note it took me 6 months to plan and prepare this holiday, travelling forward and back to embassies in Pretoria in order to arrange the necessary Visas, disappointment to my family for not be able to travel and meet people that have been expected us, and their own disappointment. Beside an e-mail of apology, Qatar Airways refused to reimburse me for the expenses that I have encountered. On top of this, their representing "agent" Travelstart took 7 months to refund me the ticket money and Qatar Airways was not able to assist me at all?