I did, and I had to pay 6000 BYR to the dollar, instead of the real price which is 5000.By the way, Hanna, since you're still there, try buying some Euros for their local currency for your next trip, and then tell us if it was easy.
You need to travel more...LOL at that staff. Wherever else in Europe can you find a MC's where the staff can't speak proper English?