It's not about the identity of the person but the limit of SIM cards per person per year. Not just showing an ID, a copy of the ID is stored in the records and you are not allowed to buy more than 10 SIM cards a year.

Just because someone says that they are scammed, the authorities would not simply prevent the alleged scammer from making calls or receiving money.

Since Bulgaria and Turkey are two separate jurisdictions, the scammed person from Turkey will need to prove in Bulgaria that someone scammed them.How are you supposed to prove what she said to you on the phone? Once the mone is transferred, it's gone. To receive a Western Union transfer all you need is a name and a code.