7 dct Sonet Reverse gear has huge lag/ overtaking is not convenient

I brought 7 dct sonet, its not worthy for your money. I drove as of now 600 km's, below are main 2 points I noticed. 1) Reverse gear has too much lag, out of 10 times only once. Your car will move backwards immediately remain 8 times it was like did I really change the gear to R mode? or any stone behind tyre? do I need to touch accelerator for immediate response? Trust me after changing the gear to R mode and taking off your leg from break pedal you can pick your water bottle, open the cap, drink a sip of water then you notice car started moving reverse/backwards, that much lag- Even I kept my both legs folded on to the seat and shown my friend to see the magic my both legs are folded see after 1 to 2 min your car starts backwards. 2) Don't test drive car in small streets and buy it. If possible request then definitely need to test drive on high way with min of 80 speed, because I felt lag while overtaking. Sport mode choose is not possible at that critical/emergency overtaking time, your decision on of overtaking judgment matters on 80 speed, you just cant look down use left hand to press mode button, then choose cluster screen select Sport then use accelerator this is full of diversion and impossible to do end up in accident. did any 7 dct owners noticed reverse gear lag/not working immediately? please let me know. thank you.