Disappointed Loyal Client

Our old faithful 3.0D4D Fortuner has a full service history with agents, is on 223000km and has been running 100%. Had the injectors replaced at Toyota Midrand a week ago and the very next day the vehicle felt grossly underpowered and turbo failed. Took it back to Toyota Midrand immediately. They had it for two days 'checking it', only to say that turbo definitely needs replacement and will cost me R76000 incl labour, parts and VAT. They also claim that car having no power and turbo failing day after they replaced injectors is unrelated and complete coincidence. And because I trusted them and took vehicle straight back to them, they had the opportunity to rectify any possible poor workmanship that may have lead directly to the turbo failing. The vehicle had zero symptoms of impending turbo failure up until Toyota Midrand worked on the engine. The above facts speak for themselves and unfortunately the trust relationship is left in the same condition as my turbo. I therefore cannot afford ****erally) to use Toyota Midrand again. Pity - they are only 3km from my house. PS Thank you to the service agent Mandy for professional and friendly service in trying to address this issue with your workshop. Your efforts are appreciated.