I find it impossible to get a refund for being overcharged for my AutoCAD LT subscription renewal.  Received an email the month prior stating that the renewal amount was $440 for another year and that my credit card would be charged on February 18th.  My March credit card statement shows a charge of $480.00. 

I contact support via chat and email.  The response I keep getting is that there was a price increase in March.  I even received an email from Autodesk support stating that the price increase was in March and the renewal amount for February was $440.00.  I don't understand.  If the price increase was in March and my renewal was in February, why was I charged the additional amount?

They have offered to give me 20 credit days on my next renewal.  I don't want the credit days, they are assuming that I will still be in business next year.