Lenovo India - Lenovo Idea Centre Hopeless machine

Brought a Lenovo Idea Centre A *** ( Sr. No: MP*FFBT*) for my Goa Flat, Caranzalem, Goa, infact it on **th October, **** was a replacement for a dead machine purchased on **th October, ****. Later within * to * days the machine started behaving weird and it would not boot and hence lodged a complaint and then it was later escalated when a Service complaint number was lodged, Sr. No: ********** and then the machine used to work well inbetween and not boot some days after keeping the machine shut for long, Later was told that they are closing this complaint and they closed it adhoc and after calling a new complaint number : Sr. No: ********** was issued, They they scheduled an engineer to replace the hard disk, Once the hard disk was replaced the display did not work and after the display was replaced it had a shadow and now the display and the motherboard is kind of being replaced.
As a customer am i not entitled for a replacement of the machine or should i be using the old machine that is continously being repaired,
The amount of time, the followups has created a lot of mental agony.