bank of america convenience checks

I have a bank of america credit card with credit available. I am

continuously receiving checks from them in the mail which can be used

to pay any bill, or use for cash which are then "charged" to your

credit card account. I decided to use one and I wrote one to myself

for $500 and deposited it to my personal checking account. I had

credit available on my credit card;,however, when my bank presented

the check to B of A it was returned NSF. The bank then charged back

my account for the $500 since the check was not paid. The real

kicker is that B of A has charged my credit card as if they honored

the check, I never received the funds, and we are in week 2 of "the

investigation" I need a credit made to either my credit card, or a

check from them for $500. I am getting the run around and need to

take the next step, but I am not sure what that is.

Niels Heemskerk