Unacceptable reasons for. Ot registraring of a claim

Unpleasant experience with Ariston bought my geyser a month ago now it's not switching on been sent from pillar to post to log a formal complaint as their geyser is faulty! I have been using some of this geysers for more than three years same installation and electricians with no issues at all hence my argument regarding their excuse for not registering a claim they are like any other insurances a ridiculous reason for not to cover .so dissapointed especially as their long standing client bought close to 20. Of this geysers