I am having some confusion in regard to billing.

Please let us know what exactly you are confused with.

I can see that you have upgraded from Bronze to Silver because you have reached the Payment Submissions Limit.
The Payments Limit for the Silver subscription is 100 Payments/month. 

You can see all the invoices in the Billing section of your Account.
https://www.jotform.com/myaccount/billing

(How to Check Invoices)

Let us know if you need further clarification.