Discover Bank Account Or Service Complaint

Discover Bank account or service department,

Checking account Deposits and withdrawals Florida

On - -, 2015 at -, I sent a request to Discover Bank to transfer $500.00 from my - - - account to my Discover Bank account. The purpose of the transfer was to cover a checks that I had made, they sent an acknowledgement of -. Discover Bank sent me an acknowledgement see exhibit -. On - -, I received a notice from Discover that the transfer was completed on - -, In the notice they made no mention that the funds would not be available. See exhibit -. On - -, they sent me a notice that they returned my check for - due toinsufficient funds. I called them and they state they reserve the right to wait up to 5 business days for the funds to clear. It took - calls and over - hours of time discussing the concerns of insufficient notice. My concerns are this. 1. In the - - email, they stated nothing with regard to their funds availability policy. Therefore, from that email, how would i know that they would they would not be making the funds available from the $500.00 deposit requested on - -? 2. On anACH transfer why would any financial institution take 5 days to clear a transaction?