I recently switch services and I thought it wont be that big of a thing to unlock my phone and use a different network

I google it and I founded a few websites and paid of course for the cheapest one and they scammed me

Now I am a bit scared what sites is real or not

Under the terms of your contract cracking that phone is a breach of contract, opening you to lawsuits.
Anyone offering to do so for free or fee is engaged in what's effectively criminal activity, of course they're going to scam you, they're criminals.

After your contract has run out, the phone company (at least here) has the legal responsibility to unlock your phone for you.
Of course 99.999% of users will just buy a new phone because by then the old one will no longer be the latest model.

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