Could not order free xFi pods

I ordered my xFI complete package few weeks back. After few weeks of assesment I got an email from xfinity that I can order 3 xFI Pods at no extra cost. In the email there was a
link to order them. I tried them and I could not order through it, I was directed to talk xfinity assistant. When I went through xfinity assistant(couple of times I had to go through)
one of the agent told me I needto go to the near by store to order it.
I went to the store and the store agent told me that I cannot order through store rather I should order through online.
When I go online it is asking for money. This is very frustrating.

How can I get these xFi pods at no cost as promised to improve the WiFi coverage in my home?