Dear bitinstant support,
I received a bitcoin payment on April 8th for my April 3rd order!  Thank you very much for getting this transaction manually processed, I am glad to have received it but we have more work to do. 

My transaction appears to have been processed at exactly $195.00USD/BTC, the highest exchange rate of the day on April 8th.  This is a much higher exchange rate than what was in effect at the time of my order.  All my prior bitinstant transactions were processed at the exchange rate in effect at the time of the order was placed and cash payment made. 

In accordance with your prior instruction on this forum, I would like to open another support request.  I am requesting a second payment be made to my bitcoin address, so that bitinstant is honoring the exchange rate that was in effect at the time my order was placed and cash payment made.   

My calculation is as follows:
My ZipZap payment receipt indicates payment was credited to bitinstant on April 3, 2013 at approximately 02:41 UTC.  In this timeframe, the mtgoxUSD exchange rate was around $105.00USD/BTC, which can be verified from historical charts.  My ZipZap payment amount was $499.00 USD.  The "amount you will receive" (net of ZipZap fee and bitinstant 3.99% fee) reported to me by the bitinstant website at the time of my order is $475.297505 USD. 

By these measures, I should have received a bitcoin payment of about 4.52664290 BTC.  I simply divide $475.297505 USD by $105USD/BTC.  However, the payment I received on April 8th was for only 2.43703982 BTC.  Therefore, if bitinstant intends to honor the exchange rate at the time my payment was received and credited, I would be due an additional payment of approximately 2.08960308 BTC to make up the difference.  This payment can be made to the same payment address.

My ZipZap Account Number: 112294442
bitcoin payment address: 19epCWs6HrEri3ZfkaCZ3j2S43XMHWyYzw
bitinstant Quote ID: 4403fffe-8496-4b57-adbf-d5ddbdfa2d88
bitinstant Event ID: 8a177a76-d3f8-4694-bac0-f426da79ba7c
ZipZap payment amount: $499.00 USD
ZipZap fee: $3.95 USD
bitinstant "Amount you need to pay:" $495.05 USD
bitinstant "Amount you will receive:" $475.297505
bitcoin received: 2.43703982 BTC
bitcoin due: 2.08960308 BTC

URSAY if you publish a payment address I will gladly tip you when this is over