Tiptronic spins – question to experts

I’m already arguing with the 2nd Audi “specialist” company. Are they only talking about the errors “beautiful” because they know exactly that this problem is known and cannot be solved? The following problem: My gearbox has a 1/2 gear more than others! At the high speed from the 2nd to the 3rd gear a noticeable speed reduction is noticeable. Both during moderate acceleration as well as kick down (also in “S” operation). Even the master noticed this during the test drive and said “now he has done it”. old”, but we were still in the same gear. Now that the control box has been replaced by the gearbox, the same problem exists. Now the “technicians” said, that would be normal and that is the case with everyone (?). Who knows the problem, who knows advice? Thank you