HP India — customer care service

My case no is [protected] crm:[protected]
I was facing some hanging issues with my lappi so process started from bios update later one of your customers care person told me to perform windows recovery on my lappi i asked her that either it will effect on my other data which i have in my other drives except c drive or not
She said only c will effect all other data in other drives will be safe.
During recovery process she told me to go for not to backing up my files
Later when whole process completed i got to know cz of her i lost all my important data
My various significant ppts, documents, excel sheets, and specially my survey sheets which i was making from last 3 months and rest other data got deleted.
All of my work just went into water