how can i prove that an address does not belong to me ?
You can't. It isn't possible. It is only possible to prove that an address
DOES belong to you. All other addresses may or may not belong to you with no way to prove otherwise.
Those are inputs to the transaction. Transactions are made up of inputs that supply value to the transaction and outputs that assign that value to an address (or more specifically encumber that value with a requirement to provide a signature from a specific private key to be re-assigned).
somebody claims that they have already sent me 26,474 BTC
And did they? Did you receive the transactions? Did they provide you with the transactionID? Did they send it to the address that you asked them to send it to?
Ok, so it looks like they only sent you 26,34163 BTC instead of the 26,474 that they are claiming? Are those the transactions they said they used to send the 26,474 BTC?
is it possible to map the 1st transaction into the 2nd and 3rd one? are they connected in some way?
Not that I can tell from a quick glance at it.
or the 1st transaction they give me is only for misleading me ?
Have they said why they think that 1PzrpRWJRzLtAdDtn1SWEAz2o2YHh9o13x is an address of yours?
if not, is there any way to contact to owner of this 1PzrpRWJRzLtAdDtn1SWEAz2o2YHh9o13x address ?
You could try sending a small amount of bitcoins from a blockchain.info wallet and include a note. Then hope that they look at the blockchain.info website and see the note. But most likely you won't find the person. The sender has the best chance of contacting the owner of the address since they got that address from somewhere. If they can figure out where they got the address from, then they might be able to figure out who owns it.
You can't.
all my address:
Depending on the wallet you are using, it is possible that you have additional addresses that you don't know about. Bitcoin-Qt for example creates "change" addresses for you and doesn't tell you about them. It then stores those hidden addresses in your wallet.dat and will update your balance with any bitcoins that are sent to one of these hidden addresses.