Re: When do you receive Ranked rewards?

You should've received ranked rewards when this current ranked series started. If not, make sure you submit a support ticket including a picture of your ranks per series to make sure they give you the appropriate rewards. 

Ranked Series 3 rewards should be a badge for all ranks, badge + gun charm for gold and up, and a dive-trail, badge, and gun charm for master / predator ranks.

https://www.ea.com/games/apex-legends/news/ranked-series-4-details

The series before last had issues with giving out the correct rewards, so I'm sure it's just more of the same.