That Addinol AHF 22 S is a replacement for actuator fluid. I created a thread for this on PakWheels. It should be changed after 5 years irrespective of the mileage.
But I don't think actuator fluid change will solve this issue.
I changed it a couple of months back without flushing. It's still running smoothly with no issues. Addinol bottle comes in 1 liter packing. Only 400 ml is used. If you are concerned with mixing, you can change it again after running 500 km.
Keep this in mind, dealerships never repair new transmissions like AGS, CVT, or DCT. They only replace it. They are not trained for this and instructed by the company to only replace it. This is common practice around the globe. Even in India, only AGS replacement is offered in case of issues like these. So keep the dealership option as last resort.
There are people in the market who know how to open and repair AGS actuator unit. As an example this person seems to have good knowledge of AGS transmissions. I found him on YouTube
Cell Number: 0301-5080122
I just talked with this person about your issue and told him some friend's car is having the issue of gear not changing after 2nd. He said he had solved similar cases in the past. But he will only fix the transmission if the actuator unit is not opened by anyone else (I hope you didn't let anyone open it).
I think you are from Lahore. This Sohail mechanic is in Vehari (near Multan). He may insist you to come to him but try to talk to him, maybe he could give you a clue what's going on with the actuator. Or see if he can refer to anyone in Lahore?
Do update us if the issue gets resolved.