The same here. But I see here that the developers should soon resolve the problem.
*[Updated Feb 2 - Hearthstone] The team is investigating reports that some players didn’t receive their monthly rewards. It appears this happened to players who had a higher carry-over rank in Twist while it was unavailable for the month than they achieved in Standard or Wild. Update: The team has determined the cause of the issue and is working on a fix. Affected players will be granted their missing rewards in an update, soon."