Season Pass: How Do I Get Credits Back From Characters I Bought?

So I already had the 4 extra characters unlocked for the 47,500 credits. Then tonight I bought the season pass and was wondering…

How do I get the credits back from the 4 characters that I already purchased with credits?

I know I’ve heard there is a way along time ago but I forgot how to.

I’m pretty sure you don’t, if memory serves. The refund you may have heard tell of is: if you unlock a character with a hero key (for example Ghalt) and then unlock him again (by reaching command rank 40), then the hero key is refunded.

I could be wrong though.

Have you tried to refound them?