I purchased an HP EliteBook a couple years back, and sold it a year later on TradeMe with the 3 year HP care pack I purchased at the same time.

The buyer now needs to use the warranty but the serial number on the warranty and the serial number on the EliteBook don't match - they are one digit off (the last number should be a 6 instead of a 5).  I'm not sure if this was a Ingram Micro mistake or my mistake.

Anyone know who I can approach at HP to get this resolved?  I can produce the original invoice showing both purchased at the same time, and we've not purchased one since.

Any help much appreciated.