OnePlus India — camera failure in one plus 3

I complained about the camera failure issue in august 2017 and without inspecting my mobile they told me to replace the camera. I told them to inspect the device as there might be some other reason which might not need camera replacement. But they denied inspecting and told me to replace the camera. After contacting the customer service centre multiple times i finally got my camera replaced in feb 2018. Moreover the behaviour of the staff of oneplus service centre at vadodara is highly unprofessional, rude and insulting. They aren't knowledgeable and they everytime replace the camera whenever there is any issue regarding the camera. They were unable to answer my queries. They treat customers arrogantly. When i asked customer care people about the issue they contacted service centre people at vadodara and told me to visit the service centre again and find the reason. The staff was highly disrespectful. When told about the incident to customer care they told service centre people blamed me that i didn't allowed them to diagnose the device. As it was the fault of the service centre people of oneplus they didn't accepted their fault and just had a "sorry and could not help me into the matter" for all the pain, time and energy i have to face just for a camera from august to march.
They don't have camera in stock for months and the customer has to invest his time and energy to resolve the issue.
I advice everyone not to buy oneplus as they don't care about the customers and don't provide timely and efficient services to the customer. You have to pay twice and thrice the amount for the device once you buy it.