I think you handled it well, it's always a good idea to get employee ID's too, so if a problem arises you have references. I got a free sling upgrade, like your case, the charge appeared on my next bill, but was corrected after I complained. It's ironic that new customers get all the goodies, but long term ones really need to do their research when upgrading.
to SAT GUYS! The Hopper with Sling is the latest receiver that DISH has released and there is a minimum $100.00 upgrade fee for this receiver for all exisiting DISH customers. It has been this way since the Hopper with Sling was released. The orginial Hopper is what is deferred too unless the customer specifically requests the Hopper with Sling. If you add a sling adapter to your existing Hopper,you can have access to the DISH Anywhere. You can purchase the sling adapter on your online account at