You're correct, most people in this country usually claim themselves they've bought a house even though they didn't fully paid in cash. There's nothing wrong of getting a mortgage, but it just people only show the good thing like "now I have a house" instead of "now I have a house and 20 years installments".
If @OP really bought with such amount without installments, pretty sure he bought a house with problem, case of double or triple certificates is quite normal here.
I have searched online and found prices that are perhaps slightly cheaper than in other countries, but not bargains like the one the OP supposedly bought. Let's hope he clarifies it, but it's entirely possible that he used that money as a down payment on the house. Rereading the OP, the terms he uses are consistent with that.