Carlo Corneli

I have a 2015 model and it seems to have intermittent transmission problems. This morning the gears would change like normal and it seems to over revv. I was doing 82 klm/hr and it was revving at 2100 rpm in gear 4. It wont allow me to paddle shift down only up. It has only done 79,000 klms and always been serviced. i have taken it in numerous times to the service centre and all they can say is there is nothing wrong? This has been going on for about a year now. I just had to have a whole new ad blue tank put on as the ad blue temperature sensor was faulty. Can anyone help?