Apple India — mac os issue

Address:

Imagine iCare,80 feet Main Road,5th Block,Koramangala,Bangalore, Bangalore, Karnataka

Hi Team, I had issue in downloading and installing the Mac OS Mojave.I downloaded and tried to install in which an error occurred stating that a particular file is been trying to convert to APFS conversion.I tried a lot and atlas contacted the Apple India Support team and they suggested to contact the Apple Authorised Service Centre and I visited and what they did was they removed my hard drive to transfer the data which was in it and the same has to be returned along with the internal hard drive to be erased and re-install the OS.For this they charged me Rs.600 only for removing the internal hard drive to back-up my data.When I tried to connect the hard drive with a Mac, its getting detected but not able to view my data.So, again I visited the same Apple centre and told them to erase and re-install the OS.On Tuesday I received a call from the Apple Service Centre stating that the hard drive has been crashed and I visited the store once again and they told me the hard drive has to be replaced for which the Apple would charge Rs.15, 000 - 20, 000 for replacing and they gave me another option that to purchase the hard drive from third party and they they would be able to install the OS.
I just got back my laptop and came.One of my friend who is working as a developer in one of the LEADING hard drive manufacturing company helped me to install the OS in my MacBook Pro.
He told me clearly that there's nothing wrong with the hard drive and it's all about the software issue.
Before visiting the Apple centre for the second time I had initiated a call with the Apple Technical Support team and they atlast suggested me to erase and install option.They found that they couldn't able to unmount the hard drive so only they suggested to erase and install option.
Now my MacBook is working in good condition.
I just wanted to know what diagnostic report they ran and why they tell me that the hard drive has been crashed and it has to be replaced.

Guys, please do not visit any Apple store.They are No.! fraud people who take money and they don't know to rectify the error.
What ### Apple is this?