I renewed my ESO Plus yesterday but I am yet to receive the crowns for doing so
Are you on XBox? If so this is a common issue.
Here is a quick Google search of the issue, with a number of threads talking about it.
https://www.google.co.uk/search?q=eso+xbox+crowns&ie=utf-8&oe=utf-8&client=firefox-b&gfe_rd=cr&ei=qDPSWIm2GKGN8Qev_IBg#q=eso+xbox+crowns+monthly+site:forums.elderscrollsonline.com&*