sorry but I am kind of confused what is a renewal block.

For example, your Diamond level expired in September 2005. September 2008 you didnt reach the 40T miles needed for retention(you were able to accumulate only 15,000 miles). From October 2008-October 2011 you only reach 34,000 miles, and you reached your 40,000 miles on October 2012...would they reinstate your diamond class again or is that a consecutive 3 yr program wherein from the time you were downgraded(Sept 2008) you have to accumulate 40,000 flying miles till sept 2011?

Thanks so much for the reply.