Gadgetshub poor after sevice

Order no 336837 100a 12v battery Ecco deep cycle. Received sunertec 100a 12v battery. This battery supplies a 280w unit for 1.5 hrs and cuts off should last for 3hrs at least. Was told to return item .which I did at R225.00 further cost to me. Now gadgetshub are silent no correspondence since 23/08/2023