The mobile technician Rhumit, replaced OnePlus 5t ...

The mobile technician Rhumit, replaced OnePlus 5t display with a duplicate one and charged me the rate of original display (Rs7500). It was only after I went to the newly opened authorised service center of OnePlus in growels mall, I realized that he cheated by installing a duplicate display. I had to pay again for the original display at the authorized service center.
When I confronted him he said it's an original one and promised me to call back but didn't revert at all.
Very bad experience