Tenses and gramma

I'm a bit embarrassed to post here mostly because I've been speaking English for over a decade. One of the things I struggle with are tenses and which one to use. Below are some sentences. Could you please check if they're correct?

1) I took a look at your usage, and it indicated that you had exceeded your allotment.

2) A review of your account indicates(or is it indicated?) that you (had?) contacted us on April 5th

3) I have reviewed your account and can confirm that you had only added the Internet package 1 which provides unlimited browsing.

4) I have reviewed your account and it indicates(or indicated?) that you (had?) called us on January 11th, 2013

5) I have reviewed your account and can confirm that your payment of $500.00 has(or was?) been applied to your account as of January 12th, 2013.

6) Our records indicate that you had contacted us on August 29th to inquire about the Internet package 1 and declined the package when the sales rep offered it to you.

7) Please note that the time stamp for usage may not necessarily reflect the actual time of when the usage had occurred.