Eureka Forbes review: Extremely poor customer service

I have been using a Aquaguard RO+UV+UF water purifying machine for over eight years. For the last several months its output TDS level was fluctuating heavily. In late February a technician diagnosed that the TDS adjuster was defective and assured me that it would be replaced soon. After that I was in Kolkata for nearly two months and repeatedly reminded the technician for fixing the machine. I was told the part was yet to arrive at the service centre. I was compelled to use bottled water. Then, after I left Kolkata 15 April and nearly a month has passed since then, today Eureka Forbes technician calls me to fix the part. Obviously, I had to tell him off. And then they send me WhatsApp message blaming me of not giving feedback whether I still needed the service or not. That is some efficiency in customer service.