Amex Credit Card Complaint

Amex Credit card department,

Transaction issue California

I have - credit card charges with American Express ( they are the same charges so it is impossible to differentiate what amount of the charges was for our purchase of their ( the merchant 's ) timeshare and what amount was for fees to enable the merchant to complete the purchase of our - timeshare ) related to - the purchase of a timeshare from a merchant and fees paid to the same merchant for the merchant to purchase our - timeshare. I am not sending this complaint regarding the dispute but rather AME- 's responsibility for the charges. AME- is assuming that illegal documents are legal and a legal cancellation is not valid. If that is the case then why is AME- ignoring the transaction exchange rate and charging us more than the agreement states? Exhibit - page -. How can AME- determine that an illegal document binds us but does n't bind us to the exchange rate?