Bad service

I have an issue,with Milex,a company I have dealt with for years,and up to now have been satisfied with their service.My problem is a Hurricane Air Fryer,which I have bought spare parts for without a problem,as a pensioner,I have to fix my own things,but now the part I need that controls the heating via a set of points has malfunctioned,but Milex insist I book the Fryer in,as the part I need, is not for sale,this is bad customer service,as I live in Sedgefield Southern Cape,and it would take a good deal of time,and money to book this in.This part is vulnerable,as the Bowl/table motor/element are.which I have had to buy, and fix since I bought it,so why is this part not available to me,so I can fix it as cheaply as possible.Is this the service I can now expect,bad Service Millex.