Defy Dualmaster Stove

We purchased a Defy Dual Master stove from HiFi Corporation. It was delivered on 5th March 2024. When the registered gas installer tried to commission it he found the stove had been incorrectly assembled. Knob labelled front left gas burner operated the back left electric plate. Knob labelled front right gas burner operated back left gas burner and vice versa. Flame failure relays did not work so impossible to light a burner. Title on stove front of stove is 'Kitchenmaster' although all the serial number stickers on the back of the stove state 'Dualmaster'. We first spoke to Hi-Fi Corporation. They logged a repair request on 6th April 2024. Defy sent a technician to assess the stove on 12th April. Two months after delivery, despite many, many phone calls, we still do not have a working stove and still do not know what Defy are going to do about it.