Havells India — Wasted Customer's Time and warranty in the name of Service just Marketing of their new app Sync app is happening

We have raised a Service request with in warranty through customer service on 30th March and after continuous calling customer care for about 3, 4 days we have received a call from an agent . He said he will come tomorrow . From then he ignores our calls and Switch off his mobile and till today it has been 7 days still we didn't receive our service . Now our warranty expired yesterday . If they would have correctly assigned people to work we would have got our services . So I wanna complain against Havells for wasting our time and warranty .