Hisense and their poor quality products are now ignoring my complain

I bought a 13kg Automatic Washing Machine from OK Furniture's, the machine made a banging noise when rinsing, i logged a complaint, the machine was replaced. I got a new unit on the 4th July, a technician was sent and the machine was tested with no laundry in it, he then advised that i must not overload the machine. this machine literally load 7 clothing items, if more then it doesn't complete the washing process, just imagine a so called 13kg machine, i have since logged another complaint to hisense and now i am being ignored on the capacity of this machine, the quality of their products are very low, i want a full refund and they must come and fetch this product of theirs and they must review the quality of their products is so low. i want nothing to do with them at all, to think i wanted to buy a double door fridge, there is no way i would do that.