Unhappy makro customer

i bought an airfyer using makro online,i didn't even spend six months with the airfryer it was piling off and started to have a rust inside. Makro must check what supplies they use,cos i trusted they would sell proper stuff. Now i returned it their courier came took the airfryer there was no communication afterwards, it's been three full weeks and couple of days waiting for communication from them nothing what a bad service they provide. I am not happy at all afraid to return the second on as i bought two of them and the problem is the same.