i dont believe what is happening now

the manager at seat uk has rang me today and told me the dsg gearbox on my boc has got nothing wrong with it ? the
problem was the "mechatronics unit" so what they have said he is going ring me monday and tell me how my car is with this new mechatronics unit installed, and if it fixes my car ill be having that boc back and not a new one? because they have said theres nothing physically wrong with my boc, so i just want no from anybody on this forum, what is the mechatronics unit and what will it do to effect my car ? i dont want a duff car back, they must of done a few more tests onit today :/ just my luck aint it really new it was too good to be true