Nonsense product and a ****ty service

I bought a Mellerware Glass kettle over a year ago, within a few moths the kettle stopped working. I took it back to the Retail shop i bought it from, they gave me a voucher as a refund. Because i liked the kettle so much i bought the exact same kettle again (biggest mistake). The kettles have a 2 year warranty and one must register their kettle on the Mellerware site( which i did for my second kettle). Now the kettle has died, i have taken it back to the store, the store booked it in. Today i get a call from the the store that Mellerware has quoted that i pay a certain amount for the kettles repair because i apparently did not register my kettle at their site. i asked the stores guy to have Mellerware call me directly, did i not have a woman form their customer services raise their voice at me and shouting??. So they sold me a ****ty quality product and have the audacity to yell at me... Who is the customer here?