This is not true. I use agoda, there is nothing that cannot be resolved on agoda. I once accidentally booked a hotel 1 year in advance instead of 1 month, when I arrived the hotel pointed out the error. I rang agoda, they rang the hotel and I watched as the woman in front of me answered the phone, they adjusted the booking to today and I got checked in. The whole thing was resolved in less than 10 minutes. No extra cost or fees.