Lenovo — Complaint about my mobile service

Address:

Satara, Maharashtra, 41502

I have brought lenovo A7000 from satara maharashtra and is still in warranty. It's home and back button not working. I gave it for repair they kept mobile with them for about 15 days changed the touchpad. But again after 20-25 days the same problem repeats again and they say it is touch pad problem and again you need to repair and will take 8-10 days. Is this the service you give.