Little experience with crypto, curious to know if what happened is normal or not

Here is the deal. I've only ever used Binance and crypto when paying for a product. So, I don't really know much but that worked out great. Yesterday or so, I was paid in USDT through a site I never used before, ByCoinApp. Now, the site didn't come across as a scam anywhere online but it is rather anonymous which concerned me from the beginning. Regardless, person is from Iran, said it's their only option, fair. They sent me the money. The problem is, withdrawing them had been a frustrating experience and a never ending circle. Pardon me if this is common, I just wouldn't know exactly, hence I am asking here just to be safe. So, I obviously sent them my ID, that's normal. Binance does that. But then they asked for a verification deposit of a 100$. A little much but sure. I did that, confirmed with support. However, when I tried to withdraw yet again, it gave me another error. This time, they had a problem with my country, Romania. Something about it being more... fraudulent? So they want another safety deposit of 300$. My question is, does such a law exist? Is this normal? Is this safe? Will they just keep asking for more? I don't even have 300$ atm and even sending the first 100 one took a lot from me. I just wanted my payment for a service I provided, how did I get here? How do I get out of here? Any tips?