Transmission Not Go Into Gear problems of the 2015 Volkswagen GTI

First issue I had was about two years after purchasing my vehicle was with my gear box. I have an automatic "dsg" transmission which began giving an error light telling me to take my car to service immediately. I took it to my local Volkswagen dealer which ended up replacing the whole box unit do to an electrical sensor not reading when I'd engage into drive. I was under warranty so it was cost free but another year later the same error is coming out and was told it would have to be replaced again but I'm no longer under warranty so I'd have to pay. I feel that's pretty unfair and unacceptable knowing its happen once and was replaced by professionals yet I'm stuck with the same situation. I feel this part should have came with some sort of guarantee after being replaced. I got this car in November of 2015 and it's pretty sad that in under 4 years I'm experiencing this scenario. Now I fear of driving knowing that error will come on at some point or worse something happen with my gears and the car be put in another gear at random. And now I'm being placed in another situation in which my waterpump is leaking coolant which I find very upsetting knowing Volkswagen had this same issue with the 201-2014 Gti mk6 and had a recall yet it seems the problem continues with the following generation. And it's sad to say but I'm at the point of calling corporate and seeing what they can do because I haven't even hit 50,000 miles and this is happening. And both of this parts are pretty pricey when it comes to labor. At this point I can only hold off and save to hopefully get the water pump replaced but as far as for the transmisson issue I'll wait to see what can be done because I feel that should be resolved by Volkswagen.