aurance
Explorer
I think the confusion might come in because the Compendium doesn't indent the power correctly. Every line after the first "Hit" line is indented, making it subordinate to the Hit. Hence, the customer service answer is correct.
You make a primary attack. If it hits and you meet the requirements, you make the secondary attack.
Make your second primary attack. If it hits and you meet the requirements, make the secondary attack.
So, yeah. 2–4 attacks.
Don't you think that's incredibly powerful for a 3rd level encounter power?