Not resolving my issue, service managers appointed that is not worth their job title

I just need to escalate my issue with Oranje Toyota Klerksdorp. I bough a new RAV4 in 2020. Since I got the vehicle the wiper in the driver side has been an issue. I took it to Potchefstroom Toyota and they did nothing about it. Then when I had my service again in 2021 at Oranje Toyota Klerksdorp again I brought it to their attention and the excuse was they don't have stock. It is now 2 years later and I went for another service on 18 March at Oranje Toyota, again the same answer. I told them on the survey I want the service manager to contact me, it was escalated to him, I got a mail on 23 March that my issue was escalated to the service manager Logan Grobbelaar. Till date 1 May 2022 I have not had any response from him. This is not good enough. My vision is encumbered when it's raining, and please don't tell me no stock on wipers has arrived in 2 years, that is such a lie. I drive to Klerksdorp to get my car serviced there but I think this was the last as their service was terrible, no feedback as requested, my problem still ongoing. What must one do to get some decent service, when you buy a brand new vehicle and no one goes the extra mile to assist in replacing a clearly factory fault wiper blade. I'm utterly disappointed by Toyota, as my whole family drive Toyota but looks like customer service is just out of the door.