Q: itunes icloud storage purchase

When I went to purchase storage, I was not given this option:

United States (USD)
50 GB: $0.99
200 GB: $2.99
1 TB: $9.99

I was automatically charged $9.99 for 1 TB. When in reality, 50 GB would have been acceptable.  Is there a way to downgrade to the 50 GB?