1. Refund of returned Kenstar one liter water heater delivered defective product twice ordered on 5th June, Chat with customer service do not allow to register concern but pre automatic questions are asked. call me now also doesn't work. 2. Ampteck battery 6 v 4.5 amp also not yet delivered though order placed on 25 Jun 21 a number of time User's recommendation: poor service asked to improve the service as suggested.