hewlett packard HP ruined my laptop remotely! Nationwide

On November 7, 2014 I contacted hp to find out if I was eligible for a new battery under my warranty or would I have to pay for one.A tech agent then decided to go into my computer and delete something off of my computer.I think he deleted a partition and now my system is not stable but since the incident I have spoken with hp and they want me to send in my laptop for repair.I do not know what do do because the company claimed that have trained technical support but how am I as a consumer supposed to trust that when I send in my laptop that it's not going to come back more messed up then it is now? They didn't even tell me how long it would take.They told me to send it in for repair and wait.This is not acceptable I need my laptop for businiess purposes.I really don't know what to do from this point.I think it is unfair for the company to not offer any other options since they were the ones who cause this fiasco in the first place.