Firstly, share the address that you sent to the other party. We can confirm whether or not he is telling the truth and whether or not he has sent coins to that address.
More specifically: copy it from your chat:
So I pasted the Receiving address from Electrum in the chat, on Local Bitcoin Exchange.
Secondly, confirm that the address you sent him is part of your wallet and you weren't victim to clipboard malware.
The clipboard hijacking could also have happened on the seller's side.
This was a purchase Local Bitcoin Exchange
Just to be clear: do you mean LocalBitcoins.com?
If you're in Europe, why are you buying Bitcoin in South America? That sounds like a recipe for disaster.