upgraded your buy for 2015 so a agreement 12910 has been canceled and a new agreement has been made # 13008 the difference from what you paid on 12/1/2014 which was the $5250.00 based off of the old agreement 12542. You will receive an invoice  1/1/2015 for an additional an additional $1500.00 which is the difference for the upgrade for that invoice period. The other two invoices will be as follows...

Payment of $6,750.00 due on 04/01/2015
Payment of $6,750.00 due on 07/01/2015