Before you call the manufacturer you'll need the serial number of the product. This is something that is usually found on the product itself. For example, on washing machines and fridge freezers it's usually found on the inside of the door.
If you're struggling though, your product manual will tell you whereabouts on the appliance it is.
What does the serial number look like?
Look for a sticker with some product information on it. The serial number is usually after something like S/N, Serial No.
An example of a serial number