Gotta call your card company............
I have a Cap One MC with a $5K limit........prepaid it once to charge a $10K item.......not allowed because my limit was $5K. Man was I p/o'd........took them 3 weeks to issue me a cheque.
I also have a VISA AVION card with a $20K limit............prepaid it by $40-50K numerous times to execute larger transactions, no problem whatsoever.
Go figure........