eReward replied on the "You have canceled your account" - they claimed it was one of the reasons below, though they could not pinpoint it -

1) Inactivity (not true as last surveys done in Mid May, with survey emails stopped coming in Mid June).
2) eRewards survey emails landed in SPAM folder (true also on my own email address, but I often restored them before deleting.)
3) Their system received a "Hard Bounce" from the email address, i.e. that email address is not valid. (not true because they replied to the reactivation request to the existing email address.)

In any case, his account is restored. Would now go to the site to do surveys so to avoid the email issue.

Still not know how many redemption (each to a different partner) could be made within 30 days period. Does anyone know about the restriction?