Service of nexa worst

The service of nexa is very very worst. I booked a car on 22 sep 18 and dealer promise me to deliver on 5th nov 18 and that day i have a function... On 5th nov 18 the manager of showroom suddenly called and said ur car can't deliver today. Then i got it on 7th nov.... And until today there is no registration of car because of dealer send all documents wrongly And dealer forcly saying that customer have to do registration in rto office.... And i have not any documents of car.... So if u buying a nexa car then thinks many times.... Thnku