Ocean Blue Hostel Vientiane

I stayed at this hostel for 3 nights. The accommodation was ok. However, I would like to report something that happened to me at the hostel. After staying at the hostel I traveled from Vientiane to Vang Vieng and when I checked my money in my wallet, someone stole 310 usd and 175 euros. I left my wallet in the locker inside the room, but I don't know if anyone else has the same key, opened the locker and stole my money. I'm sure of this because the person stole bills of 100 dollars, 20 euros, 10 euros... and left notes of 10 dollars, 5 euros... in short, he stole the highest denomination bills. I'm extremely sad because I saw good references about the hostel, and I couldn't believe that in 11 months traveling through several countries, I was being robbed in this hostel. Someone with bad intentions robbed me. My passport was inside, my bank cards and credit card, but the thief only wanted to steal the highest denomination notes, leaving the lowest denomination notes. I can't believe that someone from outside the hostel came, because there are several cameras in the hostel and to access the room you have to have your own room key and the key to the locker that was entered in the room and stolen. What it could have happened is that there are extra keys to the locker, or the same key that opens one locker can open other lockers, giving access to other lockers, as the thief opened them, stole the money and left the wallet with the remaining documents and money and closed the closet again, as if nothing had happened. When I arrive in another city and go to see my money, I was robbed. Revolting to be stolen inside a hostel. I sent a message to the Hostel, and they didn't even respond. A neglect!