Redeeming minecoin gift cards is a terrible process

Mojang needs to fix their system of redeeming gift cards for minecoins. Quite literally every time I have to go through this process, I have this problem. Often I’m only able to redeem one card within a 3-5 day period as well because the system won’t permit me to redeem a second (or more) cards. It’s really unacceptably annoying and for such a successful franchise and company, it would be appreciated if they could fix this system entirely so we customers can have a more seamless experience.