My mother has a Dropbox Plus account. When they automatically billed her for the year in december she mistakenly thought that it was wrong (she overlooked that it was a payment to Dropbox) en got the money back. She immediately found out that she made a mistake and manually transferred the money again to Dropbox. But several days later Dropbox sends an email that her account has been downgraded because she got her money back, even though she already corrected that mistake. How can I get her back to Dropbox Plus without her paying again?