Bad service

Long story short. Broke my laptop during the lock down . Took a month for them to help considering that everyone is working from home. Came took the laptop told me it’s unrepairable and will replace the item and not give me my laptop back? Asked them why cause I need the information on the hard drive. They told me or they can reverse the claim and give me my laptop back, I refused and said it doesn’t work that way .After that they sent me a form asking me to wave my rights away from my item . Which I refused to sign. Then when I told them I’ll be leaving them , they then turned around and said normal fee to give item back is 700 which they will be deducting from my pay out. Now they still asking me to sign another form with this agreed upon figures that still says Im waving my right away from my item . Can someone help please and tell me how to go about this . Honestly I’ve had enough . Worst !!!!!