Kent RO — Worst ROLL Ever Installed

Address:

Ghaziabad, Uttar Pradesh, 201005

S/N: KR[protected]
Kent Grand RO+UF+UV

Since this machine is installed we can't even count how many times the Kent technician has come for visit.
Reason of technician visit - some time water overflowing from machine, sometime machine stopped purifing water, sometime electronic parts stopped working.
Within 6 months there so many complaints but every time technician comes do something or change something then goes back.
It seems to be Kent has stopped giving good quality and have started installing duplicate product.
Can someone please help us to resolve our matter?
Or we should make our mind that Kent has no good service and we need to continue like I mentioned above?