Brand new product already diminished warranty period.

I am currently on my 3rd Geyser by Kwikot due to bursting. The first replacement went smoothly and as Kwikot is one of the largest geyser brands in SA with a relatively good reputation, so I insisted on Kwikot again with insurance company. The new geyser carried it's renewed warranty as it should as it is new (not 2nd hand, pre-owner or refurbished). My latest experience they came to replace it again, removing the serial number and warranty tag off the broken geyser and placing it on the new geyser reducing the new geyser's warranty period to the remainder of the previous broken one's. This is not only *****, but highly irregular and unacceptable. If this is the case, I will instruct (my insurance company) withing the next 7 days (as per CPA) to have this geyser removed and replaced with a brand that still cares about their client's needs as well and not JUST their pockets.