Car sales complaint

Morning guys,I really need help ,my name is mokgadi Raletsemo,contact number:*** ,I bought Nissan quashqai at CMH groups the Glen,after buying a car in less than 4months the stuck so I tried to call sales rep ,His name is Christopher vhulahani ,the guy picked my call n say m in the meeting about seven working days ,at the end he said he'll speak to the boss so the boss responded that the doesn't have warranty,so my concern is how possible is that because all the cars that comes from dealership it come with 6months warranty,so I called insurance to towering the vehicle to tzaneen limpopo is BB motors groups,so to check the vehicle they charged me 4000 ,nd the machenic from BB motors says the car need new engine bcse 2pistol has broken,so BBmotors gave me advice to call dealership CMH so they responded that they cant help me because the car doesn't have warranty,since that day they haven't call ,m stressed I need help ,hlello peter help me thank you inadvance.