Originally Posted by
Often1
Don't waste your time with phone calls. Send a note to Marriott advising that the fee was improperly charged because it was not disclosed (be 100% this was true for your booking) & ask that a refund be iissued in 7 days or a chargeback will be filed. On the 8th day, file the chargeback if you don't at least have an agreement that the property will refund.
Are you suggesting that it’s possible to charge back just the fee? Because if OP charges back the entire room charge, then your advice will likely lead to nullification of their Bonvoy account and any value it may hold. Marriott are pretty serious about this sort of thing from what I understand.