Old 50 accounts reduced to 25?

Hi there!

I have an old MEGA account which promised the lifelong 50 Gb storage.

But after getting some promotional mails about upgrading, I have now received an email about potential closing of my account, because it exceeds 25 Gb storage.

What can I do now? Can I just reach out to support and will they be true to their original lifelong 50 word?

Or is this is practice happening with all original Mega accounts?