Appalling customer service

My first experience with Turkish Airlines has been very poor.
I bought for about $A14,500 2 Business class tickets Sydney-Italy-Malta-Sydney (all via Istanbul). All for travel in August and September 2022.

Turkish Airlines did major flight changes with two flight cancellations - the first change meant that our flight from Istanbul to Italy departed 5 hours before we had even landed in Istanbul.
The second major change was that our sunday dep;arture from Italy was now Saturday and resulted in a planned 18 hour stopover in Istanbul Airpoirt.
Our agent (who is the biggest in Australia) cancelled our tickets and after 7 weeks we are still waiting for the refund. Turkish AIrlines have told our agent that refunds take 12 weeks to process. Of course we have already had to pay for the replacement airline tickets and the cancellation is only a result of Turkish AIrlines cancelling flights

With experience like this I cannot recommend Turkish AIrlines to anyone and would never choose them again.