Upvote:3
No, that isn't true.
Vietnam doesn't operate a true "Visa on Arrival" system. In additional, all visas for Vietnam have a fee. Some nationalities can enter without a visa, paying nothing and being allowed to remain for 15 days, but neither of your nationalities s are included in that list. Your options for entering Vietnam are:
You will not be able to board a flight to Vietnam without either a valid Visa, or a stamped and approved invitation letter for the day you are arriving.