Terrible service - ignoring my emails and hoping the problem goes away

I was renting a house with a Whirlpool glass hob and the glass just cracked over night. The hob has a 15 year warranty but is only 2-3 years old. The service division gave me the contact details to buy replacement parts but when I rasied the issue that it is still udner warranty and that they should repair it, they simply ignored my emails. I sent numerous follow-up emails that have been ignored. I know they receive my emails because they previously rep****, until I wanted to ask about liability and the warranty. This service is simply pathetic. Will have to consider legal action in the small claims court.