The support contract should be consistent with the license you have for AnyConnect. There are three types currently: Plus, Apex and VPN-only. Plus is by far the most common as it maps to the old Essentials license type. Apex is the next most common with VPN Only being a distant third place. Plus and Apex are term licenses that include support (which includes download entitlement). VPN Only is a permanent license that requires a separate support SKU. The entry level SKU is the one you mentioned. It is for 25 users.
Note customers typically purchase the support SKU along with the software license - it may be that your cisco.com account was not associated properly if that was the case in your situation. And, as I noted, if the original purchase was for one of the much more common term licenses then it is just a matter of getting the contract association fixed for your account.
