When try to renew expired 2-player Realm as a Realms Plus, it creates a new realm instead.

I have been trying to switch my realm to realm plus and have now wasted $16+ dollars with it only creating new realms instead of doing the switch. If I go to renew, it only has the option to renew at the lower level. I would like to get one of the extra realms plus transferred to my realm instead of attempting and wasting more money.