Very poor service after sales

The dealer really unprofessional we can not compare them with other brand dealers like Toyota, Hyundai...Delivery experience really very bad also after sales support is NIL. I bought Nexon XZ+ dark 12 days back from TERO Tata-Go Auto Delhi. staff are really unprofessional and never fully fill their commitment. also, Tata customer care is very irresponsible they also do not listen to customers. For the last 12 days, I continued complaining to Tata customer care and the dealer about some issues observe in the car after driving but both are even not listing and bothering about the concerns. I have tweeted also but so far no response.