Just a quick follow-up: I eventually received another email, saying my card has finally been found; I was told the cast member I spoke with was based on the YC (weird, the voice message stated clearly "Grand Floridian Itinerary Planning Office") and that they needed to transfer the details. Intriguingly, my CC was deemed invalid and I was invited to call back, which I did today as soon as IPO opened. I was able to smoothly give my CC details once again, and insisted upon making the reservation I needed while on the phone, just to be sure. Everything went fine, I received a text from my bank immediately, confirming a payment has been made.
I'm still not sure they haven't "lost" my details on the first call, but at least I have expressed my concerns about this, and they assured me I should not worry about my CC being associated to some other accounts…
Overall I find this process so tedious and overly complicated. Why doesn't Disney allow the IPO to use the credit card associated with the
MDE app and/or with online checkin? This does not make any sense. I'm not a phone person at all, this just adds frustration to the inconvenience.