HTC India — htc desire 828 dual sim display issue

Address:

Thiruvananthapuram, Kerala

My phone is 1.5 years old and now it is showing display problem. As per the guidance of htc care centre i gone to service centre at trivandrum. They said display stock is not with them come next week. I gone next week and they said that come tomorrow. I gone 8 times and they said the same reply. Today when i gone they harassed me and refuse to give higher authority number. They mentally tortured me. What should i do? I dont have enough money to buy a new phone.