Ktm India - Faulty engine issue not resolved

I Bought a Duke *** with a lot of love and passion, but I discovered that my bike had some engine manufacturing problems which were found within * years of usage and ***** Km approximately.

I informed that my engine was producing a strange engine noise and the heat was very high. But the showroom technician said `` This is normal``

After a ***** of usage, I again went to the showroom and reported these issues and they claimed this an engine tapping noise and asked me to use Speed petrol (But I use only speed petrol, in some case speed fuel will not available in that case I use normal one). and they asked me to ride the bike for ***KM which will help to fix the issue claimed by the technician.

And after ***KM they discovered that my bike came with a faulty engine, and they claim that the engine head is needed to be replaced and they took a week to complete the job and again I was having the strange noise, and they claim that this is normal :-(

And due to lockdown, I was not able to take my bike to the service center. After the lockdown I again went and said I am having the issue, they said to give the bike to the service center after * days they claim that my bike is doing good. But still, I am not able to solve this problem. I don't know how to solve this problem :-(