Hey LeonidS 

1.  I will look into this, that is likely the issue. 
2. Yes, in the Spam folder is where I found the first email. 
3. I'm sure others may want a refund to be the case, however, for me I just want them to be able to decide to no longer have the credit card charged and downgrade to a 'free' subscription while able to retain their information, comments, posts, etc.
4.      a)   That is currently what is happening. I would like to see that change so that, for example, out of 3 levels (Standard, Premium, Business), if a person is Standard, they only see the ability to upgrade to Premium or Business). If a person is Business, they only see the ability to downgrade to Premium or Standard. Currently they only see Premium and Business regardless of their level.
        b)  In my case, I would let the default setting for a downgrade be to let the subscription remain until scheduled ending, and not offer a refund. If the individual reaches out then the decision to give a refund can be made on a case by case basis.
5. I saw in Chargebee there is a date for the "Next billing at"... is there a way to have that data import into a membership level block?