So this time I made a reservation and the reservation process went well... however, the confirmation mail states that my CC was rejected and that my booking is not guaranteed, but my CC statement clearly says it has been charged.

I have had twice before that my payments didn't come through, even though Accor's communication stated otherwise and I am getting tired with this dice throwing game of Accor.

Come on Accor, just get your IT act together for once! I repeatedly offered you my expertise to help you out. Use it!