I've transferred your thread to Tech Consumer Advice from Speakers Corner.
Calling a ParcelForce driver a liar is not a very sensible thing to do on a public web forum, and frankly I wonder why you posted this thread in the first place.
I find it very difficult to understand why a ParcelForce driver would go to the trouble of taking a package to a local Post Office if you were in. as alan14 says - the ParcelForce driver may have evidence to show that he did stop at your house,and that could be the reason the company has rejected your claim.
Your argument is with ParcelForce, I'm afraid there's nothing we can do to help.