New Post: Suddenly Search.SearchTweets stopped working

I figured it out..
my first test was with

Since: 06/01/2015 (june 1st)
Until: 06/02/2015 (june 2nd)
Return: 0 tweets

Since: 06/01/2015 (june 1st)
Until: 06/14/2015 (june 14th)
Return: 0 tweets

Since: 06/01/2015 (june 1st)
Until: 06/24/2015 (june 24th)
Return: 30 tweets --> All corresponding to june 23rd

Since: 06/01/2015 (june 1st)
Until: 06/30/2015 (june 30th)
Return: 96 tweets --> All from june 23rd and up


it seems that the API is only returning one week of twitts.
any ideas?
I know for a fact that there are twitts prior to June 23..

here's my proof:

http://topsy.com/s?q=%40centurylinkhelp&mintime=1433170844&maxtime=1433948456

am I using it the wrong way? is there another filter I need to add so the API would return twitts more than only a week old?
thank you!