On the right-hand side at the top of the page, select "Billing" from the drop-down arrow and you will be taken to a detailed page of your month's bill.
To see SIM card allocations: Select "click here" on the bottom left corner.
You wil be taken to "Device Admin" and on the top left select "manage sim cards".
You will see "Assigned SIMS" as well as "Previous SIMs".
If anything stands out on this page, please click "contact support to query SIM cards"
Alternatively, click on the Chat icon on the bottom right. Click on "Account Queries"
For telephonic queries, call 081 880 1602 (Select option TWO for Billing).
*SMS Costs are variable in each country.