I have paid one month of Realms to play a world and I cant replace the Realm with that world.

This in-game bug prevents me from replacing a newly paid Realm with a world that I have already created. The main objective because I paid it was to play that world with my friends on a Realm. They have already responded to this comment with "we are fixing it"; However, the downside is that I already paid for a month of Realm and already spent my 30-day free trial. Is there a way to replace my Realm with a world? And if there is, is there a way to make up for the months I have already paid for?