******* That Dont Want to honour their warranty periods

Bought gel batteries and an inverter from them about 9 months ago. The batteries havent worked properly for about 2 months now. They say it comes with a 3 year guarantee but throw the consumer act in your face and that thr batteries need to be in their original boxes, which was more damaged than not when we received it in the first place. So obviously the boxes were chucked. What do they need boxes for amyway if the batteries dont work? 2 x 200ah batteries that never ran under 75%, it drew 300w at a time at most, but they still refuse. They are *******, DO NOT BUY FROM THEM.